I currently use Dell as the vendor for servers, it has worked well and I do not see switching vendors.
For PC purchases, however, I have found it cheaper to just go to a retail store like Best Buy and purchase one of there 'deal' hp machines for around $350, put win7 professional on it and then configure it for our systems.
I tried to search around for a vendor that we could purchase directly from, that would ship the same systems with no operating system configured. A lot of them said this would work only in bulk purchases, which we don't do. Others simply told us that they do not offer anything of this type.
Another option was purchasing bare bone kits and building them ourselves, which I am also not too interested in..
Does anyone know of a vendor, or a better method then purchasing from retail stores for buying equipment that might streamline the process, or even save some money? Looking for some feedback from someone else who manages this area.
Addition: We do HP/compaq at Best Buy right now - They cost around $350 each machine, and then we build the best buy reward points and get a good number of $5 - $10 certificates, which of course build up after awhile so price wise this seems to be OK, but I want to try to keep hardware variations limited.