Hi Larsen,
I put an Imac in here a couple of months ago, its well fast compared to the G5 towers. I've loaded it with CS4, Q7, Q8, Suitcase Fusion2 and all work well together. I can definately say now that some fonts behave (reflow) on the intel chip compared to q7 on a PPC. I'd really recommend an external drive for TimeMachine, knock the RAM back to 2GB if money is really tight. We got an external 1TB LaCie for £119, Ive seen an iomega 500GB in Comet for £49.99 this week.
I can't believe you think Tiger is good, you are obviously spoiled at work with your Xserve server, its been nothing but problems here since it went in with talking to old PC's, (though it does seem to work better with our brand new DELL running Windows2003 Server, - maybe just because its put together in Vancouver... Michel?) My impressions of Leopard so far are good, but everytime I use coverflow I want to drag my finger across the screen ipod style.