For my test lab at home (do you have one too?) I took delivery of a "new" server yesterday. It's a refurb Sun Cobalt RAQ 4r running CentOS (community version of RHEL) and an updated BlueQuartz under the brand name of Strongbolt from the nice ppl at osoffice.co.uk.

IMHO a very good deal - for £130 UKP (inc. P&P) it came fully configured, ready to run out of the box. Setting up virtual site hosting via the included BlueQuartz interface was relatively easy - and where I did get stuck, the forum:

www.osoffice.co.uk/forum

came to my aid (ahhhh that's how you get phpMySQLAdmin working..!)

Oh and as a plus it looks well cool as well ;)

If you want to test web sites in a "production" environment without having to actually upload to your production server then the Cobalt / Strongbolt servers are definitely worth considering. I got mine from osoffice.co.uk 's eBay member rollistag, there's one up for sale at the mo:

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=330047425777

or you could try osoffice.co.uk direct.