Go to Dell.com, configure ANY pro Dell tower to match the Mac pros. The Dells are all more expensive. Same thing on the pro laptops, the Dell comes in at $650 more (with a tv tuner as a plus).
PC's only have a reputation of being cheaper because they offer crappy entry level models and Apple don't. On the high end, Apple is one of the cheapest brand out there.
This is from alienware (who dell owns)
[1] Area-51 7500
Processor: Intel® Core 2 Quad Q6700 2.66GHz 8MB Cache 1066MHz FSB
Operating System: Genuine Windows® Vista Home Premium - English
Chassis: Alienware® P2 Chassis - Saucer Silver
Chassis Customisation: Alienware® AlienIce 3.0 Video Cooling - Astral Blue
Motherboard: Alienware® Approved NVIDIA nForce 680i SLI Motherboard
Graphics Processor : Dual 320MB NVIDIA® GeForce 8800 GTS - SLI Enabled
Memory: High Performance 800MHz DDR2 SDRAM - 2GB - 2 x 1024MB
Power Supply: Alienware® 1000 Watt Multi-GPU Approved Power Supply - UK Powercord
System Drive: Single Drive Configuration - 250 GB Serial ATA 3 Gbit/s, 7,200 RPM with 8MB Cache
Primary CD ROM/DVD ROM : 20X Dual Layer DVD±RW/CD-RW Writer
Sound Hardware: High-Definition 7.1 Performance Audio - Standard
Monitor: (None)
Keyboard: Logitech® Deluxe Keyboard UK - Space Black
Mouse: Microsoft® Basic Optical Mouse Black
Warranty: AlienCare 1-Year Free Phone 24/7 and Collect & Return
Order Total: £1,439.71 17.5 % £1,691.66
Mac Pro - £1699 for the entry level
The alienware comes with dual 8800 gts graphics cards and 2Gb ram and although it's not xeon processors I'll bet no one here would notice the difference in actual use between dual dual core 2.66Ghz xeons and a quad core 2 2.66Ghz. But the mac pro has a far better case.
