So basically it's like a GoTY edition with the extra DL content in addition to being reworked to run with the ME3 engine.
If you haven't already played the game, it sounds like the PS3 version is the one to get, assuming you don't pay $60 for it.
I think I only paid $20 for a retail copy of ME2 on PC earlier this year. No DLC inlcluded (other than online "Cerberus Network" single use key), but seeing as how I didn't even past the third hour of play, it's not something I'll miss.







