Your questions are answered already but just to clarify, the 40Gb has a 65nm CELL and a 90nm GPU.
The 45nm CELL is probably 1 year away... regarding the RSX only God knows since Nvidia is still working on a the 65nm :(
BTW: Congratulations on your decision, I'm going to buy a 2nd PS3 in a couple of weeks (got the Sony Card so I'm going to get a PS3 for $299 with 12 month no interest). I'm going to get a 40Gb, it runs almost completely silent which is awesome :)