24in iMac brighter than 20in?

Greetings. I will be purchasing a new iMac after the Leopard release. I would rather the economics of a 20 inch rather than the 24, but in store displays with them side by side, seem to show the 24 with a much brighter screen (settings were the same on both). I really dont want to sacrifice what appears to be a brighter screen by purchasing the 20in if the 24in is in fact a better display. Would appreciate any comments on this. Thanks.

Thanks for the input Jeffrey and your point about not having a side by side comparison at hopme is well taken. However,I wonder if anyone can tell me if there is a different display program in the 24 (23) than the 20 that would account for the difference? ('display program' may not be the correct terminology but as close as I can come!). I have noticed the variance in brightness in a couple different sales outlets and as I said, I did check to see both displays were set up identically. Thanks again and any others that would like to comment would also be appreciated. Cheers.

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