Running Windows will definitely benefit from the additional RAM. That's a tough decision. I see you can upgrade to 8GB for 120 Euro, although at that point you are at a 600 Euro difference...
Could you get away with the 128GB new model but with 8GB of RAM? Normally I would not suggest this tradeoff, especially if you need to run Windows, but it's another possible option.
How about a new 11" with 256GB/8GB RAM for 1299?
Ideally you could get something refurbished, but I see that there is nothing listed at http://www.apple.com/ie/shop/browse/home/specialdeals/mac
Any education discount available to you?
The big concern I have about the 2012 model is the battery life. It was already poor when new. It will be worse now. I guess if battery life is of little concern to you, then it might be an ok deal. However, having a computer with real all-day battery life frees you in ways you might not even realize if you've never enjoyed it before.
Thank you so much for the reply, I can get a student discount of 6% which is about 100 off, I think I might just go with the pro altogther just to be safe, I don't know what kind of programming i'll be doing in the future, plus it's an extra €200 on top of the 8gb 2015 air, and I'll get a better processing speed, might be just worth it plus I hear it'll last longer.
Thanks for all the help