I basically play non-demanding online games(such as combat arms), play games when they come out(such as borderlands 2) and do Photoshop CS6 design. I know these aren't fantastic, but they will be a step up from my 5770.
Specs, if relevant:
16GB of 1600 ddr3 ram
AMD 770 series MOBO
Phenom II x4 quad 3.4 OC'd to 4.0
CM v8 CPU cooler
Ample air flow and cooling fans
OCZ Agility 3 120GB SSD boot drive
assorted storage drives
hmm not sure it's worth it really...
5770 has like 80% of the performance of a 7770. Though this was at the launch of the 7770 so the gap has gotten bigger with driver updates. Too bad TPU has dropped 5770 from the list in recent reviews.. http://www.techpowerup.com/reviews/AMD/HD_7770/26.html