I see no point in getting the slim. I've got a launch 60 and I love my 4 usb ports because I can be charging 2 controllers using a usb keyboard for msging and whatever i want for the 4th port. I dnt really care about BC but i'd rather have it then not.
The slim looks uglier and i find it kinda pointless unless for sum odd reason your always taking your ps3 around (even then i could take my normal ps3 anyway). The 120gb hardrive is gud but i could easily swap out my current hardrive or just buy and plug in a 500gb external hardrive and im good to go.