New hardware - what to choose? [GA inside]

Hi everyone,
once a few years there comes a time when our hardware becomes too old and it's time for a change. That time has come.

I'm trying to find a laptop (not really considering a PC but it's also a possibility, though I'd prefer a laptop) which would meet my needs but also won't ruin my budget ;) I have about 1k USD (the actual amount varies cause I'm using my local currency as a reference so the budget isn't as important as the specs) to spend and by far the best one I've found is Lenovo Y50-70. There are a lot of configurations coming with this model and the one that would interest me the most would look like this:

Pros:

• CPU: i7-4710HQ (2.5 Ghz, 3.5 GHz Turbo, 6 MB Cache)
• Memory: 4-16GB DDR3 (1600 MHz)
• GPU: NVIDIA GeForce GTX 860M 4096 MB
• HDD: Hybrid HDD (1000GB + 8GB SSD) / 120GB SSD

Cons:

• shitty TN LCD*

This configuration would cost me around 1200-1300 USD depending on the chosen hardware.

I like the performance of the GTX 860M but I've seen a comparison with a 880M and it's nearly 2x faster... I'm wondering if the 860M would be enough for me in the long run? Laptops with the GTX 880M cost around 1600 USD (which may not sound that much more but given that the exchange rate to my local currency is more than 3:1 that's a significant amount of money).

I would mainly use it for 3D software like Blender / Autodesk Maya, game engines (mostly UE4, probably Unity) and of course gaming ;) The problem with this model is that I can't decide whether I should get 16GB of RAM and a bigger SSD from the start or buy a cheaper version with 8GB plus a slower HDD and later buy a second 8GB chip plus an SSD drive.

• The LCD can be easily replaced with an IPS some time later (costs around 100-120 USD) so that isn't a big problem.

Please keep in mind that it won't be possible for me to order from any random place as I'm limited to shops in my country.

Thanks for your help ;)