To Buy Or Not To Buy?

MAC is the question. I apologise as this has proberly been covered hundreds of times, i am considering changing to the dark (some might say brighter) side that is apple. I am looking for someone who has experianced both, windows and mac. And can give me a fair comparison. In football manager terms, and general terms. I currently have a dell laptop with 2gb of ram and a core 2 duo processer. Which struggles to run 10 leagues with a completely clear hard disk and very little eles on the computer.

The Mac i am looking at buying is around the base of the iMac desktop range (between £999 and £1200).

Any comments or suggestions will be greatly appreciated,

thanks in advance,

Matt.