there is no "modded" PS3's so far, hackers still havent been able to crack the Sony technology.
and also, the new PS3 slim is coming out in a month or so, and if I was you I'd just wait for that to come out, you'll be able to get a 120gb one for around $300 to $400....
I just sold my 60gb for $450 so I can buy the 120gb Slim when it comes out for even cheaper....
in any case just some friendly advice