@ Thread.
It all depends on where you are to what your PS3 can do.
Europe / Australia - Sony have stopped shipping the 60GB model PS3 which included memory card readers 4 USB ports and PS2 backward compatibility. I was lucky to buy a 60GB model

I love it. As for CPU, data bandwidth, the Cell is supposedly more capable but harder to program and the data though port in PS3 is greater. Look for Sony Specs for info.
Aus - 60 GB specs
- 4x USB2
- PS2 Compatibility (Software)
- Memory card readers
- 60GB hdd.
You can at the moment only buy a 40GB model PS3 in Australia. They are no longer making the 60GB for Aus and have no plans to change according to store information.
Aus 40 GB specs
- 2x USB2
- 40GB hdd.
In the USA I do believe that there was a 80GB model
The difference was that the 80 GB model had extra hardware (Emotion chip) engine from the PS2 making it 100% compatible with the PS2 and the extra space of an 80 GB hdd.
The 60 GB model does all PS2 compatibility in software and can't play ALL PS2 games, however updates to the emulator have been promised depending on demand of the game in question.
I also have been informed that Sony will no longer be making the 80GB model even for hte USA which instead the 60Gb will be the only availble one. This was all done to reduce costs.
I am not sure about region protection on BluRay or games so I don't know if it is a good idea to buy any PS3 not in your country.
Ta.