Peripherals (Razer/Steelseries) - Give me your opinion :)

I will only say abiut Blackwidow as it's only one I used. It's a great kb, but imho not worth it's full price. I bought it in promo on store closure and it was worth it, but full price - no-no. It's design and usage are great, but it use to miss a click every now and then (not too often - every few play sessions I noticed such a thing). It's not a very big deal but for an expensive gaming keyboard for full price - not acceptable.

As for mopusepad - I'm using SteelSeries QcK for nearly 2 years and no problems.

As for mouse - I'm a R.A.T. fan and no Razer mouse feel nearly as good for me as R.A.T. 7 so i won't post opinions ;P

Honestly, I would just get a better quality mechanical keyboard. The Razer Blackwidow is decent but its kind of overpriced for the quality of what you get. I would go for the cooler master line of keyboards if you want something or for Filco/Ducky/Rosewill instead for just a high quality mechanical keyboard.

I'm a Logitech guy. So I recommend the Logitech G500 mouse. But I'm sure what you've selected is fine too.

• What do you think of my choices?

You would probably be better off going Logitech or Corsair for your picks. That new Corsair K95 keyboard looks awesome, but it isn't out yet. I passed over all the BlackWidows for the K90. My reasoning would be the overall quality of Razer products, which is hit or miss. Make sure you actually want Blue Switches. Those are more for typing. You can look at non gaming mechanicals, too.

The g700, g500, and other mice from logitech would likely offer more features and hold up longer. The new Corsair line looks really nice, too (The M65 and M95).

You might want to at least consider looking past Razer products, for the sake of getting some comparisons, even if you decide to go with them anyway.

The 2013 Deathadder is a decent mouse but Razer has subpar quality in general so it could very well develop problems.

Recommending the R.A.T. 9 as a mouse. A lot of customisation is possible, making it the most comfortable mouse I've used to date (and I've tried a lot!)

Nice and responsive too. It's also wireless, but has a neat system with 2 hot-swappable batteries. One charges while the other is in use, meaning you never run out of juice. Takes 10 seconds to change them over if you're in the middle of something :)

I agree with most of the above. BW is overpriced.Check the Coolermaster mechanical keyboards.They are pretty nice and solid.
Also Logitech has announced a new mechanical gaming keyboard.
Mouse I'd go with Logi.I own 1 MS Intelli Optical,1 Logi MX 510,1 Logi MX1100 and 1 MS X8.I have tried some of my friends Razers but i find their build quality lacking at best.I would also go with G400 or G500 from Logitech.
As far as mousepad is concerned I used to have a QcK+ until it was wasted and no i have my old S$S and a QcK normal size.I m pretty satisfied with both (although the lack of the extra space that QcK+ had makes me thinking about buyin a new one).I have also heard good things about Puretrack Talent so you might wanna give a go at that too.

If you don't need many features in your mouse, I would recommend the Logitech G400. It's pretty good for the price it has.

As for keyboards, I recommend not getting Razor branded ones. I have a real life friend that used the brand. It didn't even last 1 year.

Buy a Genius Netscroll+ and be 1337.

Buy a mechanical keyboard, I prefer filco. Razer breaks easily in my experience.

Mouse: Logitech G500
Keyboard: Corsair K95
Mousepad: Anything by Func Industries.

That is all.

I'm left handed and recently wanted to upgrade from a three button mouse to one with side buttons. Because left-handed mice of that sort aren't as numerous as right-handed ones, I eventually narrowed down my options to a SteelSeries Sensei made as an ambidextrous mouse, so buttons on both sides, and a left-handed Razer. Price-wise, the SteelSeries is more expensive, but as luck would have it, Amazon had a damn good day-only discount on it a few days after looking into them, so a price difference was a non-issue.

For my purposes, I went with the SteelSeries. Although the cons for the Razer may have been specific to the left-handed one, as I read numerous reviews where it seemed to have certain issues. The SteelSeries, though, seemed to have overall better reviews... and it allows you to turn off the LED, which I'm glad about.

I can't speak towards the Razer's quality, but as far as first hand experience with the SteelSeries, I've had it for a few months and so far so good. It does what I got it for, and not only do I get the side buttons that I was wanting, but two more buttons on the other side, too, which I've made use of. However, do note that it may be a double-edged sword to some, as you may bump the other buttons with your pinky until you get used to them there. I can't say I've had that issue after the first few days.

Razer Taipan: The shape of the mouse makes it slightly uncomfortable to use, more so if u are a palm grip user. I switched to a DA BLACK soon after. (Its just that the DA series suits my gripping style)

I'm a huge fan of the Corsair Vengeance series keyboards and mice.

Never had trouble with my Deathadder, I use it with a Goliathus Omega mousepad and find it a very good setup :)

Keyboard is a standard Dell backlit board, serves me fine.

Nice choice of Keyboard