Need help on building a custom machine..

Ok I want to build a PC by these specs. I mainly need help on the RAID and the Tripple Monitor hardware part.

I need to setup a RAID on regular IDE that will use 2 hard drives and 1 hd will mirror the other (in case one burns out, we can use the 2nd, I think its called Raid 0?)

I need a video card that will let me run 3 desktops, 1 on each of the 3 monitors.

I also need a board that will support 3 256MB DDR chips and a 2.4~3.0ghz P4 with HTT, preferably a board with intel/realtek chipsets.

Onboard audio and lan are even better

Thanks guys, I'm new to the raid and tripple monitor video. I've done a dual (1 tv, 1 pc monitor) but I need a 3 pc monitors (preferably flat panel) setup.