many breakers in modern houses are only 14 guage wire and a 15 amp breaker or 12 guage wire and a 20 amp breaker
Remember Just because you might have a 1000w power supply many computers will not use even close to it, ie I have a hd7970 card crunching at 650 mhash/sec and my whole computer only pulls 300 watts from the wall even though I have a 700w power supply.
get yourself a killawatt unit to check power draw $25 at radio shack
http://www.radioshack.com/product/index.jsp?productId=3025184&utm_source=Google&utm_medium=PPC&utm_term=55026789&utm_content=Exact&utm_campaign=PLA&cagpspn=pla&gclid=CLD7_5yi0LYCFSJ0MAodBnIAAA&gclsrc=ds
most home outlets are 15 amps x 120v = 1800 watts
also map out your outlets to which breaker they use, ie put 5 computers on 1 outlet, and 5 on a different one connected to a seperate breaker.
Lastly you can have aelectrician install a 30-40-50 amp 240 breaker and really make up a power center in your garage.
Most homes have a 200 amp 240v panel these days that is a lot of watts
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George