I've been playing the PS3 version for a while (just beat it last night). I've heard the PC version is better in several ways but is it good enough to justify buying it at full price. Green Man Gaming is selling it for $40 right now. Are the improvements good enough to pick it up for that price, even though I already played through it once on the PS3, or should I just wait for summer or winter, when Steam has it on sale?