roar.. if you have 3k to spend on a computer.. build your own or have someone professional build you a PC... a mac that costs 3k will probably be a dual core with like... 2.6ghz ... with 3k you could have a quad core pc .. and have much more power for your buck.. macs are Godly, but they are very costly... build a pc with 3k and you can make a GODLY pc.. even more godly than a mac that comes pre assembled for the same price.. ..rawr...
Actually $2800 will get you a MacPro with 2 Quad-core 2.8 (8 processors)...
The problem I've always seen with my friends that build their own machines are the funky "bugs" that they inevitably have... there is always something that never seems to work right or some strange system bug that is just something you have to work around.
These aren't usually major things... just "funky" annoyances... and those are the things I don't miss after having switched...