Here's the Backup Server build I just did, kinda overkill for BITS backups, but my client had cash to spare (And who knows what it might do in the future?)
https://michael.hess.name:81/computers
SUPERMICRO SuperServer 7044H-TR 4U Barebone Server-Rackmount - Retail Item #: N82E16856162007
2xIntel Xeon EM64T 3.0 Irwindale 800MHz FSB Socket 604 Processor Model BX80546KG3000FA - Retail Item #: N82E16819117034
4xCORSAIR 1GB 184-Pin DDR SDRAM DDR 333 (PC 2700) ECC Registered System Memory Model CM72SD1024RLP-2700 - Retail Item #: N82E16820145308
2xWestern Digital Raptor WD740GD 74GB 10,000 RPM Serial ATA150 Hard Drive - OEM Item #: N82E16822144160
4xWestern Digital Caviar RE WD3200SD 320GB 7200 RPM Serial ATA150 Hard Drive - OEM Item #: N82E16822144407
ASUS Black IDE DVD Burner With 2X DVD-RAM Read Model DRW-1608P2 BK - OEM Item #: N82E16827135046
iomega 32929 Black 90GB Internal IDE/ATAPI Interface REV Tape Drive - Retail Item #: N82E16840107133
And yes this one is running win2k3 ent server 64bit.
https://michael.hess.name:81/computers
SUPERMICRO SuperServer 7044H-TR 4U Barebone Server-Rackmount - Retail Item #: N82E16856162007
2xIntel Xeon EM64T 3.0 Irwindale 800MHz FSB Socket 604 Processor Model BX80546KG3000FA - Retail Item #: N82E16819117034
4xCORSAIR 1GB 184-Pin DDR SDRAM DDR 333 (PC 2700) ECC Registered System Memory Model CM72SD1024RLP-2700 - Retail Item #: N82E16820145308
2xWestern Digital Raptor WD740GD 74GB 10,000 RPM Serial ATA150 Hard Drive - OEM Item #: N82E16822144160
4xWestern Digital Caviar RE WD3200SD 320GB 7200 RPM Serial ATA150 Hard Drive - OEM Item #: N82E16822144407
ASUS Black IDE DVD Burner With 2X DVD-RAM Read Model DRW-1608P2 BK - OEM Item #: N82E16827135046
iomega 32929 Black 90GB Internal IDE/ATAPI Interface REV Tape Drive - Retail Item #: N82E16840107133
And yes this one is running win2k3 ent server 64bit.