I would recommend Cougar Extreme. IMO you will struggle to find anyone who will provide superior customer service, range of choice and quality of build & components for the price.
With Cougar you basically pick the case you want from the extensive range, then the amount of memory (most if not all of the memory is Corsair, which is about the best you can get) you then pick your PSU brand/power rating, you then choose what DVD/CD drives and amount you are wanting installed.
I have recently used Cougar's customer service due to a fault on my PSU and basically they could not have been anymore helpful, they arranged a pickup of the PC, this was free, all other PC companies I have dealt with have expected me to pay the return to them shipping. Cougar even fitted me the next model up of PSU at no cost as the PC was under warranty.
I simple cannot recommend them enough. If you do a search on here for Cougar Extreme you will see how highly they are thought of.