Had a chance to try out the iMac 21.5 model with the ATI 4670 graphics card at the Regent's Street Apple Store this afternoon.
I had the same pleasure, in the same store, last Thursday. It was a shame they didnt have any bottom spec 21.5" model on display.
Anyway, I was so impressed with the 1.5hr demo (with one of the guys in the blue t-shirts) that I placed an order for the 21.5" ATi model this Tues. Its currently en route from Shanghai of all places...but it hasn't moved location for around 30hrs..[according to the UPS tracking facility]..
Can't wait.