Custom Built Computers

the eric conspiracy writes: For several years I've been buying custom barebones systems from Monarch Computer based on a recommendation I found on slashdot, and have been happy with the result. However in 2006 they really went downhill, and now appear to be out of business. So I am looking for suppliers whom I can go to for a computer where I can specify the motherboard, case, power supply, memory on a piece by piece basis, get feedback from the supplier as to whether these items would be a reliable combination, and have the supplier assemble the custom system and test it. The system may just be a motherboard and CPU, or it might be all the way to a complete package. Any suggestions?