Yeah, I know what you mean.
I'm mental-ing up what my gaming rig is going to be like and I had considered a Mac Pro (as it's the only way to go).
My main computer at the moment is a 2.16Ghz, C2D, 2gb MacBook Pro and with Leopard I'm just finding it so sluggish. The wireless internet connection is very poor and Adium is cutting out at least a few times a day. Photoshop CS3 is slow, as is ripping DVDs and the disc drive is spitting out discs (When burning) with what I think it is a hardware problem.
I'm so tired of it that I think the Vista computer will be my main rig. I don't want to go back to Windows but on hardware at the same price (£1,300) I find Windows to be simply better.
Macs being able to run Windows is such a huge thing - that truly hasn't been fully put to use yet, in my opinion. But Apple charging stupid prices for diluted gfx hardware just makes the decision for the vast majority of top-end pro users, a very easy one.
Not dumping on your thread EVH and I understand the premium you pay for Macs is for both design and of course the brilliant OS X. I just wish Apple would realize there's a market of pro users there who know that a 7300GT is no longer: "High End Graphics".
Enjoy your iMac and be sure to get lots of pictures up. 24" inch screens are brilliant and I remember the first time I plugged my MBP into the 2407, looked great.
edit--
Or maybe scratch the last sentence!