Budget Graphics cards with reasonable capabilities.

Price range?

Nvidia GTX650

Buy an AMD R7 265.Sapphire one has the best price/performance.
I don't like Nvidia since their drivers tend to fail.Especially Nvidia audio drivers will rape your FPS if you actually install them.I strongly recommend AMD over Nvidia.

Here is a site I like to use from time to time.

http://www.logicalincrements.com/

The Nvidia GTX 660 seems to be about $200 from a quick search and I would recommend it from my experience I don't have the latest most graphically intense games but it handles everything i throw at it very well mostly on high settings

r7 260 2 gb is really good and it's cheaper than 200$ i believe its around 100-140$ see it(http://www.videocardbenchmark.net/gpu.php?gpu=Radeon+R7+260X&id=2701) and GTX 750 (http://www.videocardbenchmark.net/gpu.php?gpu=GeForce+GTX+750&id=2825)

and this might help you compare them (http://www.game-debate.com/gpu/index.php?gid=2075&gid2=1912&compare=geforce-gtx-750-ti-gainward-2gb-edition-vs-radeon-r7-260x-gigabyte-2gb-oc-rev-1-0-edition)

I run a Radeon HD 6670 I got for about $60. It does remarkably well, considering. I can run Watch Dogs with settings on high at decent framerates, for example. (At least until it inevitably crashes because they haven't patched the bugs out yet. ಠ_ಠ )

Also, here's a couple of links that might help you: link 1 link 2

Maybe this will help?

In this price Radeons have better price/performance ratio.

Go get a GTX 750 Ti.

I remember a few years ago my brother and I got a Nvidia GT 220 (or something like that) for around $60.
It still works just fine for anything I'm playing, though the processor is still kinda not great... When there's hundreds of objects or particles on screen at once the game tends to lag up a bit.
Just letting you know, the graphics card isn't everything.

Either R9 270 ($170+) or R9 280 ($230+). Nvidia cards in that price range are simply worse. Both the 270 and the 280 are good enough to run any modern game on decent settings with a good framerate. The 280 will last a bit longer as it's about 20% faster than the 270, it requires a better PSU though.

If you are not completely broke and if your PSU is good enough I'd pick the 280.

GTX 650 Ti is a good option...

If you are really on a budget, the GT640 should do okay. Just be sure to get the GDDR5 version, same goes for anything else with a GDDR3/GDRR5 option

Asus GeForce GTX 760 2GB DirectCU II
Little bit more than 200$

What is the rating of your PSU?

If it still matter MSI GAMING N750 GeForce GTX 750 1GB 128-Bit. is $140 on Newegg and its pretty good card.

go to 300 $ instead of 200, new gen card are way better

I know you said you prfer NVIDIA

but the XFX Radeon HD 7870 is a pretty solid cards, I can run pretty much any game on high/ultra with no problem(to note, I haven't played any of the big 2014 AAA titles.. they aren't really interesting me)

only thing is I had adjust the casing slightly of mine because the fans were hitting it(and remove the bar saying its the 7870), and that fixed my only issue with it(its probably a defect I could've RMA'd, but it was easy to fix at home)

though AMD, I'd say R9 270X Tri-X Toxic from Sapphire.

Well I have an XFX HD7770 and it has run everygame i have thrown at it with no problems. You Can get it for something like £100 :)

Rather save that money for a GPU instead of giveaway xD
270/280x R9s are definitely nice GPUs. But, it really depends on which games you're gonna play, and on which resolution.
Also, please note, that, in case same shit repeats like with Watch Dogs, where Nvidia's Gameworks doesn't let AMD get proper drivers, I guess going with Nvidia is better.

GTX Casio downgraded edition.

XFX r9 270x double dissipation for 159.99