Opinions on Linux OEMs?

bradburn asks: "I'm in the market for buying a new computer and I want a machine with Linux and have it properly configured. I'm thinking about buying a computer from either Penguin Computing or VAresearch but I've not seen any reviews on them. Has anybody had problems with them? How easy are they to deal with? Are there other companies which preload linux I should consider looking into?" Whoa! A whole barrel full of questions? Anyone care to answer?