About to get an iMac for my wife, she doesn't want the 27" b/c it's "too big" So, I was about to get the 21" ATI (3.06GHZ, 256MG 4670) for $1375. But, just found last gen 24" NVIDIA (3.06GHZ, 512MG GT130) for $1450. Seems a no brainer, bigger screen and more video memory for $75. Any reason not to go old school vs. the new hotness? I know lots of small stuff gets refined in revisions, but these machines are only 7 months apart, and the 24" was a $2200 machine originally. Thanks for all insight!