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The problem for me now is things like which hardware, what hard drives, how much RAID, whether SSD...

These are questions people should be asking with their P2P setups as well. Servers can run on the same hardware as a desktop. I don't like how people only get RAID if they are on SBS. You should get it no matter which OS you have. Operating systems sit on top of the hardware. I'll say it a million times, it doesn't matter if you have Windows 7 or Server 2008R2 DataCenter, get good hardware.

Also, if you have a budget in mind, check out the recommended thread. Price has dropped a bit with hard drives returning back to their normal prices (~100 for a 500GB Enterprise Drive). According to Dell a 500GB drive still costs $280 though lol.