I want to build a PC I can use as a 24/7 automated trading system and I need suggestions/recommendations for hardware to buy (and how the hardware should be configured). I've been building PCs for years so I'm not worried about how to put it together, but rather what to put in it. The basic requirement is that I want the PC to be able to survive a hard drive failure of the boot drive. I've had this happen to me twice (the boot drive died a horrible death) and although I had a backup, the PC was down until I could get the drive replaced. I assume RAID is the way to go but I'm not sure. I would plan to have 2-3 hard drives in the machine, maybe 2 for booting (1 as a backup in case the main boot one dies) and another for data.
I would also like it to be pretty quick but I won't see much different between a 1 GHZ processor and a 3.5 Ghz processor for the systems I'm running.