Seeking sites/stores in search of gaming rig.....

[Karl-Heinz Jaeger]

I'm currently in the process of getting the cash together for a new pc, and am looking for any sites or stores that sell extreme custom gaming rigs. I'm obviously looking to spend as little as possible but without sacrificing performance/quality. Basically assume a maximum of 5000 euro, which is USD$6,300 or CDN$7,000 or about GBP£3,500. May seem like a lot over there, but thats what the good stuff costs over this neck of the woods. I'm looking for places that offer a selection of custom moddable tower cases and top of the range, latest tech type components to kit it out with. I'm hoping to put together a serious machine running an AMD FX series processor, 4 gig of RAM, Twin SLI GFX cards and a top of the line Audigy sound card or better. These are pretty much the basics, the rest is gravy. Anyone any inkling? Thanks for your thoughts.