I recently built my computer and wish I would have just bought one of these HPs:
http://forums.slickdeals.net/showthread.php?t=678341
You can get...
– Genuine Windows Vista Home Premium (32-bit)
– Intel(R) Core(TM) 2 Quad processor Q6600 (2.4GHz)
– 2GB DDR2-667MHz dual channel SDRAM (2x1024)
– FREE UPGRADE! 256MB NVIDIA GeForce 8400GS, DVI-I, TV-out, HDMI
– No Modem
– 320GB 7200 rpm SATA 3Gb/s hard drive
– LightScribe 16X max. DVD+/-R/RW SuperMulti drive
– 15-in-1 memory card reader, 2 USB, 1394, video, audio
– ATSC-NTSC TV tuner with PVR, FM tuner, remote
– Integrated 7.1 channel sound w/front audio ports
– Norton Internet Security(TM) 2007 - 15 Months
– Microsoft(R) Works 8.0
– HP keyboard and HP scroller mouse
– HP Home & Home Office Store in-box envelope
For $700 with free shipping.
Here is the partlist of what I built yesterday...
[$80] Antec Nine Hundred
[$60] Antec 550w Truepower Trio
[$210] MSI GeForce 8800GT
[$280] Intel Q6600
[$90] Gigabyte GA-P35-DS3L
[$110] 4gb RAM, 2x2gb G.Skill DDR2 800
[$85] Seagate Barracuda 7200.10 320gb OEM
[$32] Sony DVD/CD-ROM
[$170] Windows Vista Ultimate OEM
[$20] Fan, HS and thermal paste
Total before tax & shipping: $1,137
As you can tell, the only real advantage mine has is $40 worth of RAM (2gb is cheap) and the videocard, which is ~$200. Mine doesn't have a TV tuner or memory card reader, and I'll have to buy an antivirus program pretty soon. Also, I got a pretty good deal on a few things, like the case and power supply (normal price would've been nearly 2x that).
For $800, it'd be really tough to build a comparable Q6600 machine with a legit OS.