It all just depends on how much memory you'll be satisfied with, because all the ps3 slims are pretty much the same except for internal memory. 120GB would be good enough, 250GB would last you a good while and 320GB would be more than enough.
I have a 250GB system myself which has been lasting me a good while and haven't had to worry about running of save memory. If you want a good deal, just go for the system that has a low price.
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