I've got some more specific arguments.
About my live-stage Hackint0sh, build up in April 2009.
This is not the latest and best MacPro with Xeon and 16 cores, this is only a "small" Quad Core computer, made of cheap parts. But this computer is enough for me and my friends to do heavy Live sessions on the stage with lot of musicians - and lot of realtime processing. I never had any OS crash or greyscreen, it work 100% reliable and fast.
The main reason for me to set up an Hackint0sh is that I want to use OS X on my stage box but I don't have the money to buy another Apple Mac. (I have one 2008 MacPro in my studio) But I have a lot of experience as OS developer and administrator and so it is no problem for me, to set up OS X on nearly Mac compatible hardware. My deeper IT skills are a big hidden part on the bill, because I own this knowledge and always find a way to the informations - this is priceless for me

And I'm a big fan of UNIX (40 years old now!) and OS X is the best incarnation of UNIX for the multimedia productive desktop. I don't like Windows, use it rarely, I don't think Windows is made for artists like OS X is made for. My personal taste; but I don't "hate" Windozers. Most of us have no choice and we have to use what "they" given us. I understand. But this is not for me, I have the choice. I'm not a stupid Applefanboi with a small iBratwurst and a Mac to get some iSauerkraut. I'm one of the serious "computer as a tool" handicrafts. Enough about me and my opinions, get some facts:
THE BILL
Geekbench 64 score: 6075
Compare to: MacPro 2008 (4 Core)/ca. 2500€:
5556 MacPro 2009 (8 Core)/ca. 3000€
8214
(see
http://www.primatelabs.ca/blog/mac-benchmarks/ )
OS Mac OS X 10.6.2 Snow Leopard
Hardware and prices (4/2009):
Mainboard: ASUS P5B-VM SE
50.-€
CPU: Intel(R) Core(TM)2 Quad CPU Q6700 @ 2.66GHz
130.-€
Memory: 4.00 GB 1066 MHz DDR2 SDRAM
50.-€
HD: 3 x Seagate 500GB
150.-€
Case: Custom made 19' case:
60.-€
Misc: Power supply, Cooler etc.
100.-€
Extra: Belkin Firewire PCI Card
40.-€
GPU: Nvidia Geforce 7200 SE
20.-€
+Mac Box (Snow Leopard, iLive, iWork)
150€
Total: 750.-€
Pro:
-very cheap but reliable hardware
-feel and act like a real MacPro
-can do Mac updates
-not illegal in Germany to build up and use a Hackint0sh if you bought a legal copy of OS X
Con:
-not so quiet as a real Mac
-no "sleep" mode
-case is more industrial design so Apple fanbois are mostly pissed off when they see this hacki...
-no Apple support
[EDIT]
-added the price for the Mac Box OS/Software Bundle
-some personal words and a link to Geekbench Scores