we saw the benches, the new cre 2 duo chips aren't a heap of a lot faster then the core duo chips. so if you think you're going to gain a massive speed boost then forget about it.
honestly i wouldn't buy an imac for 2 reasons tho:
1. i don't like the look too much
it looks OK, but not like HOLY OMFG CHECK THIS THING OUT. the day apple sells imacs in brushed alu enclosures then i'm selling a kidney to get one.
2. WWDC is in 8 days, see what comes out then, and then MacWorld Paris is in September.
for the record i had an intel imac, i got rid of it for financial reasons, it was a great machine but it didn't really go with my style. i wear lots of dark clothes, i drive a black car, i have an IBM ThinkPad. I'm not depressed or anything, or goth, i just think that everything looks sexy in black.