rackshack seem pretty good now...
if you are not in a rush you can normally catch a bargain in their daily deals where you get set-up for $1
I was going to go with them but they sold out the day i wanted my server so i went with
www.sentris.com as they had a better package (slightly)
for $95 p/m I get
1.3ghz celeron
256mb
55gb drive
450gb bandwidth (based on avg. 15gb per day)
it comes with some kind of control panel but not sure which one...
The server runs fine (although i did have to kick up a fuss and send some strongly worded emails to be put on a decent backbone at first) but support is non existant as it is an unmanaged server so short of re-booting it for you dont expect any help.
its worked ok for me so far so i cant grumble but i still have my eye on the compaq server with the 10mb cogent line on rackshack.net
perhaps in the near future