I also use Mac's and PC's but for me the PC wins hands down.
A few problems everynow now and again is a small price to pay for such a versatile system.
With pc's we get alot of power for our money, you have to consider that those lovely dual G5 still get out performed by single CPU pc's.
The Mac's are still very limited software wise (most of the old guard of mac software is available on PC's now anyway)
Although it has to be said the new Mac OS is very good. Its each to their own I guess but its the PC for me :o)