Wing Commander Fowler,
I am not sure what prices you would pay over there, but this is where Best Bang for the Buck would be at:
AMD Athlon64 3000+ Socket 939 90nm
MSI K8N Neo2 Platinum
2 x 256 PC-4000 or 2 x 512 PC-4000
Thermaltake Polo 735 Heatsink/Fan
Radeon 9800 Pro 128Mb
2 x Western Digital SATA 7,200rpm Hard Drives (For RAID 0)
16x Double Layer DVD+/-RW
Put that in the case and he can take the CPU from 1.8Ghz to 2.25Ghz with that Heatsink/Fan and run the RAM at 500Mhz DDR for a great overclock and with the 7.1 Surround Sound on the Mobo along with the Radeon he would have a great comp to run a flight sim, as well as Doom3, World of WarCraft, Halflife2, etc.
Take Care,
Richard