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It's more of a question for me of whether to go with the 20" over the 17" just to be able to get video upgrade. I still don't like the overall frame size/brightness of the imac and would seriously consider putting the imac behind (or off to the side of) a large thin frame monitor.
 
heh. where is the 'mac' when you need it?!?!? a headless version of the iMac, but not quite as small/non upgradeable as the mac mini. would have a full size HD and a non-integrated video card (like the iMac). maybe even a PCI express slot for the video card (similar to the old CUBE, but could accept a full size video card) the 'mac' would be between the mac mini and the mac pro!!!!

until the day there is a 'mac' id ask yourself how long you want to keep the iMac. if its for a long time (like 4-5 years) then go for the 256mb in the 20 inch iMac, the 256 will be more 'future proof'. otherwise if you want to keep if for about 2 or 3 years then go for the 17" and youll survive with the 128mb of video.
 
I wanna use Vista on my new computer and since i have a 20" screen already i'll want to use dual screen. The 128MB in the 17" isn't enough to run both screens with Aero in Vista. I need to get the 20" with the 256MB upgrade, however for that price i get a very very good PC.

Give me 256MB upgrade for the 17" please apple 🙂
 
unless you plan on using a second monitor with your imac, i don't think its worth it. I would use the money towards more ram.
 
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