I think this depends on how comfortable you are with servicing your own equipment. If you can tear down and re-build a server, the software, configure RAID arrays and such, you can probably get away with purchacing your own box/software.
The following is MY OPINION. I have 10+ years of server technology experience so take it for what it's worth.
Proactive technologies has the most robust boxes you'll ever find. On-board RAID redundancy (not so uncommon these days) dual and tripple redundant power supplies. Dual and tripple redundant cooling systems, isolated RAM, Video, CPU, Hard Disk Drive, RAID bay and case cooling. (All monitored) not to mention very good support.
Dell is an excellent all-around box in most cases. Support is phenomenal and if you purchase their Silver level support option (less than $1000 a year, depending on the box) you can get on-site service in under 4 hours. The hardware is solid, this is what we use in our facility.
HP and IBM in my opinon have very poor support. HP's hardware is marginal; I have used several systems (server) and was never really happy with any of them. IBM's hardware is better, but you will pay through the nose for it.
Do consider Apple servers as well. If "TF" has an OSX version, you'll never be happier with a server system. The software is much more intuitive, and if you're already an Apple organization and familiar with the OS, you'll love the server.
-Brian
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