You have to be very specific to get a realistic estimate.
Alienware Aurora:
Alienware Aurora Chassis
525W Alienware PSU
Unknown Motherboard
Intel® Core™ i5 760 Quad Core 2.8GHz (8MB Cache)
Alienware High-Performance Liquid Cooling (looks like the H50/H70)
Genuine Windows® 7 Home Premium, 64bit, English (which is OEM)
Unknown 4GB Dual Channel DDR3 at 1333MHz
ATI Radeon™ HD 5870, 1GB GDDR5
Unknown 1TB HDD - SATA-II, 3Gb/s, 7,200RPM, 32MB Cache
Integrated 7.1 Channel Audio
Unknown 24X CD/DVD burner (DVD+/-RW) w/double layer write capability
Misc. Alienware extras (software, OS customization, lighting)
1-year warranty
No Keyboard
No Mouse
No Monitor
No Speakers
- $1,599.00 (free 5-7 day shipping atm)
Newegg Shopping Cart:
Corsair Graphite Series 600T Chassis -$150 after $10 MIR
CORSAIR CMPSU-550VX - $70 after $10 MIR
GIGABYTE GA-P55-USB3 - $120
Intel Core i5-760 - $205
CORSAIR Hydro H70 CWCH70 - $90 after $15 MIR
Windows 7 Home Premium 64-bit OEM - $100
G.SKILL Ripjaws Series 4GB (2 x 2GB) DDR3 1333 (PC3 10666) - $60
XFX HD-587X-ZNFC Radeon HD 5870 1GB - $260 after $30 MIR
Western Digital Caviar Black WD1001FALS 1TB - $88
ASUS DRW-24B1ST 24X DVD Burner - $17
- $1,160 + $5.81 (3-day shipping) = $1,165.81
Difference of $433.19. And that's being generous. I could've skimped on the mobo, case, memory, HDD, and PSU. Nor did I price shop.
So even on their lowest priced rig, you're still paying a hell of a lot for the Alienware extras, warranty (pfft), and pre-built convenience.