Both cases fit the CPU cooler and are quiet. The FT02 also fits graphics cards up to 12" in length. Which is a slight improvement over the 290mm that the R3 does.
If you want a Z68 based board, add 27€ for the Asus P8Z68-V Pro 186€.
The i7 is better if you do stuff other that gaming because it supports hyper threading. Generally stuff that uses a lot of threads like rendering 3d models and such.
But for gaming use the 100€ or $100 price difference is usually too big to justify the tiny improvement ( if any ) in performance.
So I would say that if you want to get the i7 instead of the i5 , you can. But your experience in gaming won't really change.