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If you don't mind me asking, why are you using php_fcgid instead of say, modphp? I've heard of crazy problems with fcgid, but I've never heard of that kinda stuff with modphp before.

Also, I would suggest looking at amazon ec2 too. It has some advantages, like it is better able to scale, and you wouldn't have to worry about drive failure anymore. Also, if you buy a reserved instance (requires paying for one year up front), it is much, much, cheaper than buying hourly based on usage. Anyway, not sure if it's right, but it would let you scale better and you wouldn't have to worry about hardware failures quite as much anymore.