24GB in what, 8GB DIMMs? Don't most X58 boards have 4 slots?
6, except for the cheapest ones.
I disagree that they're not a good value. If your time is money and you use your computer to make money, and if the Mac Pro can get things done faster, doesn't that make it an outstanding value?
True, but comparing hardware vs Core i7 systems leans heavily against the Mac Pro cost-wise. If there's a Mac only app that you need to run and it's a justifiable business expense then alright, but for all but those folks with excessive disposable cash it's a tough sell.
I see what you really want - you want a Core 2 Quad iMac. Remember that iMacs are built with mobile parts. Are there Core 2 Quad mobile parts yet?
Mobile quads are available
, they're just expensive and have relatively low clock speeds. iMac's are otherwise fine (if not very upgradeable), but like you the thought of spending much north of $2000 on an AIO is not happening.