So which of of three should I get:
- 128 Crucial M4
- 128 Corsair Performance Pro
- 120 Intel 520
I do play games, but I'm using other hdd for steam folder and some apps i.e. adobe cs.
If you can afford any of those, I would personally go with the Intel one.

I have the Intel 510 series and it works brilliantly, I can only imagine the 520 is just even better!