PS3: Other than memory, is there any performance difference between the 160g and 320g.?

The increase harddrive space helps in the long-run (memory is a whole other thing entirely... it's not memory, it's hard drive space). 1-2 years from now, the system might slow down due to lack of disk space if you play often enough. Otherwise, they're all the same. They have the same nvidia graphics card, the same hdmi plugin capability, the same number of USB ports and wifi.

The real thing is to ensure you get a new model, not the older. The older models got hotter, the wifi wasn't as good, the graphics wasn't as good, and it consumed more electricity overall because the newer technology is more sophisticated in its power usage along w/ its other purposes.

not really just that if the 160g starts to get full it will start going slower where as the 320g has more memory so it will be unlikely for you to get it full that quick but if your not going to be using 160g then 160g is the same at 320g

nope the only difference is the storage space. All depends on what your going to use the PS3 for.

If your just going to play games and have a some DLC for the games. 160gb is good. If your downloading movies and lots of games from the internet go with the 320gb

There is no difference in the consoles apart from the storage capacity.

That isn't memory, it's storage space