Then don't build a PC. There's no way on the planet an i3 system costs $700. Here, for example, is an i7 system, complete, for just over $700:
http://www.amazon.com/Acer-AME600-UR378-Desktop-Black/dp/B009AAU9TI/ref=sr_1_5?s=electronics&ie=UTF8&qid=1360156243&sr=1-5&keywords=i7+pcIncluding Windows 8. That took me 10 seconds to find. There are plenty of uses for an Ultrabook like the Surface Pro, but as a desktop. That's beyond stupid. There are plenty of laptops with the same CPU in the $500 range that would make a far better desktop, as well.