Another 64-bit vs 32-bit thread. Compatibility?

Ok, so im getting a new pc and don't know weather or not to get 32-bit vista ultimate or 64-bit. Is there a compatibility test or something anywhere?

What sort of compatibility issues are there?

My dad's got a Western Digital MyBook external hard drive, will this be ok?

I have i Western Digital Elements external hard drive, will this be ok?

What about games do all game work on the 64-bit or not?

And, finally does SP1 have anything to do with this? (increase compatibility or anything)?

Thanks

Thanks, thats what i thought, but better safe than sorry.

P.S. what do you think of this? for £900

CPU: Intel® Core 2 Quad Q6600
CPU Cooler: Coolermaster Eclipse
Motherboard: Asus P5N-D SLI
Memory: 4.0GB Corsair DDR2 800mhz XMS2 (2x 2GB)
Hard Drives: 500GB S-ATA2 3.0Gb/s
Optical Drive: 20x DVD±RW DL S-ATA Lightscribe
Graphics card: NVidia GeForce 8800GTS 512MB
Sound card: Onboard 7.1 Audio
Operating System: Microsoft® Windows Vista Ultimate 64-bit
TV card: PCI Digital TV Tuner Card
PSU: 750W Thermaltake Toughpower
Case: Thermaltake Armor

Thanks, thats what i thought, but better safe than sorry.

P.S. what do you think of this? for £900

CPU: Intel® Core 2 Quad Q6600
CPU Cooler: Coolermaster Eclipse
Motherboard: Asus P5N-D SLI
Memory: 4.0GB Corsair DDR2 800mhz XMS2 (2x 2GB)
Hard Drives: 500GB S-ATA2 3.0Gb/s
Optical Drive: 20x DVD±RW DL S-ATA Lightscribe
Graphics card: NVidia GeForce 8800GTS 512MB
Sound card: Onboard 7.1 Audio
Operating System: Microsoft® Windows Vista Ultimate 64-bit
TV card: PCI Digital TV Tuner Card
PSU: 750W Thermaltake Toughpower
Case: Thermaltake Armor

corbula

Thats ok i suppose. If thats a pre-build thats pretty good!

Yes it's pre-builtcorbula

Thats a good deal then if you get some sort or warranty with the thing!