I currently have an Intel I5 750 running on a ASUS P7P55D mobo. 6GB of DDR 3 ram, Nvidia GTX 570 and a 120 GB OCZ AGILITY 3 SSD.
I wish to upgrade and was wondering if I would see a significant improvement if I went with the I5 -3570K along with a new Z77 mobo. I have a budget of around $600
That depends on what you want to see the improvement in
Your 570 is certainly not outdated, but you would get a +20 increase on your FPS at the minimum in most games. Usually much more.
6GB of RAM is fine, I've never used anywhere near that with gaming.
I see some other posters saying that their i5 750 was a bottleneck in some games, and would especially do so along side a 600 series GTX GPU (for example).
I'd do it!!