HP Server vendors

I am looking for a vendor that can help me with acquiring AND CONFIGURING an HP
DL-360 1U Rackmount server.

Ordinarily, our end users (who have so far been large power stations with large
IT budgets, and consequent volume hardware and support deals with HP) have
sourced equipment for us. As we now want to supply the equipment ourselves (for
the benefit of smaller customers who do not have the volume deals with HP), we
need a friendly vendor.

In particular, I am looking for the ability for a vendor to be able to swap and
change bits of specification to suit our needs, for instance, replacing the
standard TS-L162 CD-ROM drive with a DVD+-RW drive (such as the DV-W28E (HP PN
336084-9D2), and possibly preinstalling Redhat Enterprise linux ES4 on the thing
(or getting HP to do it).

Any takers?

Jim