Bought SK for my laptop so I could use mods, have to play on low settings so it's not the prettiest (I have a PS3 too and a copy of SK) for reasons like these, got fed up of the game crashing everytime I went under water (did they ever fix that by the way?)
Good on you mate. Re-purchasing it on the system that will give you what you want (and even willing to take a graphics hit to do so) is certainly a more timely manner to which you can have your fun, rather than waiting on the game to be fixed on the PS3 and complaining ad nauseum on the forums. I applaud your take charge attitude.
Yes, they fixed the water crash bug, you have to delete the game update and let it redownload. Thread about it stickied in the PS3 forums.