The apple store had a rev a iMac 20 in stock for $1500. The sales clerk said that it was an ultimate better configuration than other rev a. Here are the specs 1.8 powerpc 160 gig hard drive wireless with wireless keyboard and mouse 512 ram it is missing a wireless airport card and the gigabit ethernet. I have a airport express and wanted the imac to join my wireless network but for $300 dollars less (the price of the middle 17 in model) it seems like a good deal. Do you think I should get the rev a ultimate over the rev b?