What parts? I can’t see any list of parts you’ve posted, other than the original links to pre-builts.
Since you’ve first posted this thread the Radeon 6850 came out and at $180 it’s a steal, since it runs almost identically to the $240 GTX460 1G.
Assuming you’ll be gaming at 1900x1200, and already have an OS, here’s what I’d recommend as a good start. It’s got some very minor corner cutting to hit the price range, mostly sticking with an HIS GPU and a budget level case, but both would work fine. This config is about as good as you can get without hitting the diminishing returns curve. These are all newegg prices as of today, but you could probably get better deals by buying some of it from Amazon and using their free shipping over $25 (especially on the computer case).
LITE-ON 24X DVD Writer Black SATA Model iHAS-324-98
COOLER MASTER Centurion 541 RC-541-SKN1 Black Aluminum bezel, SECC chassis MicroATX Mini Tower Computer Case
SAMSUNG Spinpoint F3 HD103SJ 1TB 7200 RPM SATA 3.0Gb/s 3.5" Internal Hard Drive -Bare Drive
HIS H685F1GD Radeon HD 6850 1GB 256-bit GDDR5 PCI Express 2.1 x16 HDCP Ready CrossFireX Support Video Card with Eyefinity
CORSAIR Builder Series CMPSU-500CX 500W ATX12V v2.3 Active PFC Power Supply
GeIL Value PLUS 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10660) Desktop Memory Model GVP34GB1333C9DC
ASUS P7H55-M PRO LGA 1156 Intel H55 HDMI Micro ATX Intel Motherboard
Intel Core i5-760 Lynnfield 2.8GHz LGA 1156 95W Quad-Core Desktop Processor BX80605I5760