<p>Hi! I use both systems: PC with Vista Pro and 4GB RAM and Mac Mini OSX with 8GB RAM on similar mashines about 5-6 years old. Mac is more reliable system, during this years I had to reset computer maybe 7or 8 times. Windows system stop working more often about three times more often. When I`m working with files from 7D in Photoshop and Bridge both computer are similiar in speed e.g. developing RAW in Canon DPP or photoshop cs4(WIN) cs5(Mac). Maybe Mac is a little bit faster, but it isn`t big deal or worth to pay difference.<br>
What is better in Mac: you can add more RAM for example 8GB or more. (To do it in Windows system you should buy 64 bit version and that is extra cost)<br>
What is better in Windows: you can use more programs (and free editions) and equipment like scanners, disc, pc cards and so on. (You won`t do it on Mac Pro in cheap way:) )<br>
But I like working on Mac in Canon DPP more:)</p>