Help me build my PC

I need to build a base unit on a fairly tight budget - not really into latest games but do like to play on the odd occasion so would like a fairly decent machine. The spec I have chosen is as follows (prices excl. VAT):-

Mobo: Asus A8N-E SKT 939 NFORCE 4 AUDIO LAN PCI-Express ATX - £54.94
Processor: AMD (Venice) Athlon 64Bit 3200+ Socket 939pin 512k L2cache 90nm Retail Boxed Processor - £95.30
Memory: Corsair (VS1GBKIT400C3) 1024MB (2 x 512MB Matched Pair), DDR400 / PC3200, non-ECC, Unbuffered, CL3, Memory Modules With Lifetime Warranty - £54.23
GFX Card: 'PNY Verto GeForce 6 6600GT PCI-E 128MB GDDR3 (G66600GN1F12XPB) Retail Box - £85.15
Hard Disk: 300Gb SATA300 Maxtor Diamondmax Plus 10 (7200rpm,16MB) - NCQ - £76.74
PSU: 420W Tagan I-XEYE Blue Light Whisper quiet 21db aPFC 12v EPS/SATA/XEON ATX/BTX - £40.39
DVDRW: NEC ND3550A 16x DVD±RW Dual Layer Internal IDE (Black) - OEM - £24.62
Case: Not decided?

This lots comes to around £435 excl. vat - £520 incl. + £5.00 P&P allowance.

Any comments/alternatives welcome...:D