While I think Apple computers are expensive, they have power, the Dual 2GHz 64bit G5s would leave my mono-32bit 1.4GHz pentium 4 in the dust. And software, lets see I use Opera, vIRC client, Starcraft, Adobe Photoshop, Star Office, and KaZaA.
Macs have E-mule, something called Limewave or somethin, Starcraft, Safari, Adobe Photoshop, Star Office (I believe), Microsoft Office if not Star Office, and IRC clients are a dime a dozen, I could use CGI IRC off this website for all it matters.