Need your opinions for this budget build

This is my first build. I want to experiment with it and really hog on it for awhile until it makes me build a new one. I already have a Pentium D 830 which Im going to beat the begesus out of until I have to get a new. My plan is to buy some budget things - OC the crap out of them and see whats what out there. This is a budget build. Im completely open to suggestions for alternate components as long as you can justify your reasoning (not just something like "Corsair RAM RULZ!!!").

Case - Ultra Black Aluminus ATX Full-Tower Case with Clear Side, Front USB, Firewire and Audio Ports - $80 (tigerdirect)

Mobo - ASUS P5KC LGA 775 Intel P35 ATX Intel Motherboard - $150 (newegg) (seat of the pants choice - whats your recommendation?)

Ram - OCZ Platinum Revision 2 2GB (2 x 1GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model OCZ2P800R22GK - $62 (newegg)

Video - ATI X1900XTX 512 - $200 (ebay) (I dont think I want a DX10 card just yet with the advent of 10.1 on the horizon)

PSU - APEVIA ATX-AS600W-BL ATX12V / EPS12V 600W Power Supply 115/230 V CB IEC 950/ TUV EN 60950/ UL 1950/ CSA 950 - $60 (newegg)

Ive got a burner sitting here I can use. Whats your thoughts on this build?