Rate this Prebuilt vs Homebuilt

I am considering buying a gaming rig with the following configuration. It is a new pre-built, so it would not be possible to reconfigure or upgrade anything prior to purchase.

I have noted the approximate cost of the individual components for comparison to a homebuilt system using the same parts, although it seems unlikely anyone would want to do so.

LIAN LI Signature GX2 Brushed Silver Aluminum tower case with clear side window and three 120mm cooling fans. [Note: basically a modded PC-7A Plus] -- LIAN LI PC-7A Plus: ($109.99)
INTEL Core 2 Quad Q9450 Yorkfield 2.66GHz, overclocked to 3.2Ghz -- ($234.95)
ASUS P5N-D -- ($134.99)
CORSAIR 4GB TWIN2X4096-6400C5 -- ($56.99)
LITE-ON DVD±RW (Lite-On DH-52C2S-04: $21.90)
LITE-ON DVD±RW/CD-RW (Lite-On IHAS220-08: $29.99)
15-in-1 Memory Card Reader (Verbatim VER95343: $25.99)
Custom water cooling system with 120mm radiator (Asetek LCLC or CoolIT Domino: $89.99)
HITACHI 750gb SATA hard drive (cheapest: $120.00)
EVGA GeForce 9800 GTX 512MB ($149.99)
BRAU-NAUT Custom-built 500w Power Supply with Dual 80mm Blue Lighted Fans ($49.95)
Microsoft Windows Vista Home Premium SP1 64 ($99.99)
Bundled/Installed Software: Other than 3DMark06, Diskeeper, a digital media package and the typical Adobe stuff I'd download anyway, seems pretty much free of annoying trialware packages and icon clutter.

Purchase or build, the no-name PSU would have to go, replaced by a PC Power & Cooling 750W, and the hard drive is a no-brainer. I could live with pretty much everything else on the prebuilt-- for a while.

This pre-built system was $1999 if ordered direct from the builder in mid-2008, but the price has been significantly reduced. I can buy it for $1060 delivered vs about $1,000 in parts, plus shipping. Thoughts?