WinXP32 Vista Dual Boot On Raid 0, Which Raid Driver, 32 or 64 Bit?

Hi all,

The Egg just delivered the components for my latest gaming rig and have a couple of quick questions please. First the components:

UD3P MB
E8400
Sapphire 4870 W/ 1GB 5GDDR
8 GB Kingston HyperX
2 WD Cavair Black 500GB HDs Using Raid 0
Corsair 750W PSU

Questions:
(1) I plan on a dual boot of WinXP32 and Vista64. I want the XP for legacy games and the Vista for DX10 eyecandy. I have read up on how to do this but with the UD3P, there is both a 32 and 64 bit pre-installation driver for the raid. If I plan to install XP32 first, when installing the raid driver, which would I use?
The protocol calls for 2 partitions with each OS installed to it's own partition. So, if I use the 32 bit driver for the XP installation, when I install Vista on the second partition, would I use the 64 bit driver when it installing it? I am not sure but logic tells me that using 2 different raid drivers would screw the pooch on the raid itself given it's loaded at bootup. Am I wrong?

(2) The XP install CD I have does not include SP2 and I am running into the PCI.sys error. Is there another way other than slipstreaming SP2 into the OS install CD? I don't mind going this route but if there is an easier way, I'd like to hear about it. The alternative of switching out the vid card after the SP2 install is probably not possible (I have an old PCI card with 4MB memory but don't think it can handle the 24" LCD that this box will be using).

Any experience or thoughts on these questions would be greatly appreciated.

Merry Christmas To All,
Sinkhole