Here is another comparison against a mac desktop and my custom built computer.
Tried to make it as close as possible for the specs but apple doesn't let you customize your hardware that much.
Mac Pro Quad-Core (Desktop)
Price - $4,424.00
CPU - One 3.2GHz Quad-Core Intel Xeon W3565 processor
Turbo Boost dynamic performance up to 3.46GHz
RAM – 32GB (4x8GB) 1333MHz DDR3 ECC R-DIMM SDRAM
Hard Drive – 512GB solid-statedrive (They didn’t have anything less in config) Cost + $600 (Ha)
1TB 7200-rpm HD
GPU - ATI Radeon HD 5870 with 1GB GDDR5
Optical Drive – DVD Burner 18x
My Custom Built Desktop Computer
Price – $2119.40 Give or take a hundred or two for extra’s
CPU - Intel Core i7-3770K Ivy Bridge 3.5GHz (3.9GHz Turbo) (4.2GHz Overclocked); - Cost - $329.99
CPU Cooling – Corsair Hydro Series H100i Water Cooler
Cost - $109.99
MotherBoard – GIGABYTE GA-Z77X-UD5H
Cost - $198.49
PSU – Corsair Professional Series Gold AX1200 1200W – Cost $279.99 Overkill I know
RAM - G.SKILL Ripjaws Z Series 32GB (4 x 8GB) 240-Pin DDR3 SDRAM DDR3 1866 Cost - $219.99
Hard Drive - OCZ Agility 4 128G2 - Cost $144.99
1TB Western Digital 7200-rpm HD - Cost $80.99
Case - Thermaltake Level 10 GT Cost - $239.99
GPU - EVGA GeForce GTX 680 2GB GDDR5 – Cost $479.99
Optical Drive - Asus DVD Burner 24X – Cost $29.99
The build quality is the same and the quality of the hardware is the same if not more for custom built I would say. But I will let others be the judge on which has the better hardware and specs, I'm just comparing the price tags.
Difference is $2,304.60
So for desktops Mac's are WAY WAY overpriced in my opinion, for laptops they are a little overpriced but probably worth it in my opinion.