UO is so old almost any newer computer will run it well but UO is a memory hog, even with the newer ones. I personally would get at least an IBM i3 but you would be better off with an i5 2.0 ghz or higher and 6-8gb ram. newegg.com has some great deals if you build them or you can find a nice pre-built there or other places. If you build, make sure that the processor and motherboard are compatible and same with the ram and motherboard. They have a lot of decent combos that you can buy all 3 together at a nice price.