jamesparkinson said:
I've been advised that what I am effectively buying is a very expensive, large laptop minus the portability( apparently a complete waste of money).
You've been advised wrong
Once upon a time (few months ago
) laptops used very different chips from desktops. That changed with Core 2.
With Core 2, all Intel chips from mobile to server/Xeon share the same architecture. Mobile versions may cost more and not be offered at the top GHz, but they are essentially the same chip otherwise, and are VERY fast. They generate less heat than Conroe (which means they run quieter too) and thus are perfect for compact desktops--which explains why they were chosen for the iMac. Anything could happen in future, but I wouldn't hold your breath for Conroe--and that's not such a bad thing: Merom is an outstanding processor.
This "complete waste of money" iMac tests out VERY fast--it even holds its own against a Mac Pro in many tests. (It has only two cores instead of four, of course--same as Conroe systems.)
Bare Feats has lots of tests, including:
http://www.barefeats.com/imcd4.html
I was going to get a Mac Pro myself--but instead I have ordered a 24" iMac/7600. Still very fast and a lot cheaper! I could replace the iMac every few years and STILL save money compared to a pro tower.
And in fact, the stigma against mobile chips hasn't made sense for some time: recent Pentium Ms (the chips that came before Core "1") tested out, at the time of their release, very close to the speed of a top-end desktop Pentium 4!
But people have prejudice against something with "mobile" in the name. (Either that or prejudice against Macs, and "mobile" is just an excuse to call a Mac a waste.)
Mobile in this case means cool, compact and quiet. It does not mean slow