Go for the best price. It's so easy to upgrade to a larger hard drive. There are plenty of youtube videos on how to upgrade your PS3 drive and it doesn't void your warranty. On a new system it's even easier to do since you won't have any data to backup and restore.
Check out a video and if you don't think you'll know how to swap in a larger hard drive then just go for a package that has the games you want.
Opinions aside, PC is expensive but prettier. Consoles are cheaper and much more convenient.
If budget's not a concern...then it goes like this...
FPS = PC
RPG = Consoles
Racing = PC / PS3
To answer the original question, if all is the same, go for the 160GB which should be plenty for your saved games, etc. If you plan on using your PS3 as a movie medium, then you can hookup an external drive to your PS3, which is much cheaper and more convenient in the long run.