PC configurator sites ????

Hiya!

I'm trying to find a few more sites that allow you to configure a computer the way you want it built and then buying it. I've only found two so far ... Ibuypower.com and cybperpowerinc.com Are there any other sites out there like that?? I'm trying to buy a computer with limited resources and these kind of sites are the only thing working for me. I would sooooooooooo appreciate it if anybody knows of any that they could post it for me. I don't want to go somewhere that isn't reliable. Know what I mean??

Thanks so very much!!!