Since no one else has mentioned it, I'd give some thought to buying a UPS also.  I bought an 825VA UPS last year, which gives me 16 minutes of runtime when at idle.  My PC is close enough to the one you mentioned, although I have an 850W PSU, and mine is plenty big enough so you could go lower.

 

I got mine fairly cheap for an 825, but one in the 650-750VA range will cost you ~$70-100.  Definitely cheaper than having the power go out and frying half your new computer.

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