Which MacBook Pro should a designer choose?

Question

macbook

I plan to go to Thailand for half a year, I need a laptop for comfortable work with Photoshop and Illustrator. Last year I carried an iMac 21.5" with me - I had enough impressions =)
I read "Toaster" for a long time, but I still haven't made up my mind. I settled on a Macbook Pro Retina 15" of different options
: 120 (i7 2.3Ghz / 16Gb / GT 750 2Gb / SSD 512Gb) - price 65 tr.
2. Used, mid 2014, 300 battery cycles (i7 2.5Ghz / 16Gb / GT 750 2Gb / SSD 512Gb) - price 105 tr.
3. New Macbook Pro Retina 15" MID 2015 (i7 2.5Ghz / 16.0Gb / AMD Radeon R9 M370X / SSD 512Gb) - price from 143t.r.
4. New Macbook Pro Retina 15" MID 2015 Top configuration (i7 2.8Ghz / 16.0Gb / AMD Radeon R9 M370X / SSD 1TB) — price from 182k
UPD
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At the moment, I'm more inclined towards used models, due to the affordable price and the fact that for such a laptop will not shake and blow off dust particles like from a new one.The questions remain:
1. What is the difference between the models of 2013, 2014 and 2015, are these differences significant in terms of work?- With the same characteristics, for example, Core i7 2500 Mhz / 16.0 Gb / 512Gb SSD / AMD or Nvidia discrete graphics card
2. Are there any pitfalls when buying these used models - I read that after the first year of release of the retina, many of the anti-glare coatings began to bubble ..

Answer 1

Get the
15-inch MacBook Pro with Retina display
2.8GHz Quad-core Intel Core i7, Turbo Boost up to 4.0GHz
16GB 1600MHz DDR3L SDRAM
512GB PCIe-based Flash Storage
Intel Iris Pro Graphics + AMD Radeon R9 M370X with 2GB GDDR5 memory
It's like as configured through the store. Just for 1TB SSD an overpayment of $500. It's better to pay $200 for a processor and later buy a giant hard drive for $300.
Take yourself a little later an external hard drive for several TB and you will merge archives onto it.

Answer 2

There is such a model mbp MD101, the best option is to
buy it, put an ssd there and more RAM.
you will have a nice car. Deshego and angrily.
The diagonal is just to carry, the retina is nonsense, do not pay attention to the retina.