We are working together to provide PC's designed specifically for Multiboxing, so it can be a one stop shop and skip out on the guess work of what is needed to get up and going.
They offer lifetime phone support, and a 1 year warranty. It definitely beats the hassle of building it yourself, and I know of 1 user on the forums that purchased a PC and it actually turned out to cost less than building from the same parts.

I am getting a PC myself here in a few days and will be able to elaborate more in the coming days.