Well Dedicated servers are all available with Hosting companies.
They come in following popular flavours: Win NT, Win 2000, Unix, Linux, RaQ.
But how much you can shell out depends on the next categorisation:
Your Own Server
Rent and Lease to Own Server(You buy cars that way. Don't you?
Co-Location means placing that server at the datacentre/NOC of Hosting company.
If you own that server, pay for Power,Airconditoning, Dust-proof environ, electronic security(motion sensor,etc.)Fire protection, Disaster proof, on-site service engineer, on-site spares, on-site tape-backup, on-site upgrades,supervision etc.
If hosting company owns a server you pay for services and hardware rent. Monthly, quarterly, six-monthly, yearly. The longer the more discounts you get.
Some providers give fixed bandwidth 50GB/month service and hourly emergency service also.
They also provided smaller fragments also for low traffic.
I hope most of your queries have been answered.
If you are still troubled. You can get me up during you night time at: ABhatnagar@SUPERB.NET