What Ludi says. Getting the experts to compete brings out the helpful, educational tidbits too.
If you play a cheaper quote off against a more expensive one, the expensive guy will tell you why you absolutely cannot operate without a somophlange, whilst the cheaper guy will tell you why two doohickeys are way better and more cost effective than a somophlange. You get the best quote and you learn a whole lot more about the field you're looking into.
I hear rig lists are all the rage, and I <3 the rage! Workstation = Black tower thing; HTPC = Shhhh!; Laptop - AMAZING FOLDING PC!