Don't try and buy at once ..just get whats on sale or best prices and it can be done with better hardware as I just built a $500 dollar rig with a FX6300 and HD7950 ..
I got this power supply for $44.99 and Newegg offer a extend warranty for 1 year $7 or 2 year $12 with free replacement and free shipping..
Power supply looked brand new and ran great and later I bought the 2 year plan which makes $57
Also Newegg has refub HD7950's for $169 but was $139 two day ago and I'm sure you could get a extend warranty on it.. or buy one from ebay for around $119
This is some the parts I bought at those prices as my FX6300 came with a free game for the extra $10.. but if I waited I cold of got it for $99 and saved $10 to spend on something else.. just take your time and get the most for your money.