Funny thing, I just took a browse through Apple's site. The closest G5 that I can build to my comp cost over $1000 more ($3200 vs $2000 - 60% more expensive), which isn't even taking into account the fact that I built mine over 6 months ago, so a comperable system today is significantly cheaper - or you can get a better system for the same price.
For all of that, the G5 is using an inferior processor (Dualcore PowerPC 2.3Ghz vs Athlon64x2 4400) and inferior video card (GF7800GT vs GF7800GTX), and lacks the options and exandability of my comp. Not to mention it's running an OS now shown to be slower than WinXP.
Really, Macs have their good points, but you should give the fanboi-ism a rest.