I'm thinking of grabbing a 2.66 13in MBP off the refurb store. I know that the CPU is about a 10% difference but how does that 10% reflect on helping the 320m?
Get the 2.4 and put a bigger hard drive in it with the difference. You can get a 500 GB 7200 RPM drive for like $60 and sell the stock 250 GB for like 30. I' owned both and the difference is negligible, especially compared to the new base 13" MBP.