Get a 'known name' unit that is at least bronze efficiency. It might seem expensive to start with but you can keep using when you upgrade the current computer.
Gold efficiency is really not that hard to get affordably. These also tend to be the quiet ones. >>>>> http://www.silentpcreview.com/
Gold efficiency is really not that hard to get affordably. These also tend to be the quiet ones. >>>>> http://www.silentpcreview.com/