It should work. The GPU will fit inside the case. I was looking for the dimensions of the current PSU to make sure that the new one will fit. I can't find them but it should fit. Glad you updated the PSU. Better choice.
Thanks for the quick reply. Can you answer me 2 more questions?... Will my CPU bottleneck my GPU? and Should I buy a the GeForce GTX 770 2Gb or 4Gb? I'm a little confunsed there..