hi, what will be the average price of the following dedicated server spec?

p4 2.4, 1gb ddram, 1500gb transfer, 80gb harddisk? managed and unmanaged

Search around for different dedicated server providers:

www.ServerMatrix.com
www.Managed.com
www.EV1Servers.net

For unmanaged/semi managed (depending on what you consider to be managed), I'd like to recommend the following company: Tailor Made Servers (http://tailormadeservers.com)

They have great prices and exceptional support.

1500 gb is normally more then the budget dedicated providers give you.