Basically what the title said, if you don't want to build it yourself what are the recommendations for companies that build a killer machine?
I know most of them force a decent premium, but if there is one that's more reasonable than the others I'd like to note that as well.
EDIT: My mistake. I live in the US. I'm not sure quite what else to offer. We're talking 2-3k I would probably be willing to spend on the tower. This isn't some kind of 10k throw money down the toilet thing, just a very solid, very powerful machine. Used primarily for high end gaming.