Every host I've checked prices dedicated and colo separately, making the package far too expensive. I figure that if I'm already paying for the plug I should be able to colo a second server at a discount. Do you know of any hosts that allow that?
I don't believe I understand your needs correctly... Do you mean that you would like a dedicated server and colocation at the same price, or do you just need dedicated AND colocation? If it's the latter, I know of some very nice specials and regular dedicated servers that my colo and dedi provider is offering.
EDIT: Okay, what I understand is that you think that there should be a discount... this is the case with most webhosts. They offer some sort of affiliate or reseller program that gives you percentage discounts per server/colo space. And if you find hosts that don't offer this, one reason might be that they are filling up quickly and don't want that many new customers, or they just don't have the resources to introduce a discount program.
Thank you all for your suggestions. Yes, I want to do both dedicated and colo, using the same internet connection.
Basically, my servers are getting old and so I'm thinking of migrating to a new box on the new host then using my current main server as a geoIP advert server. (No sense throwing that box away.) I'd probably use 4U total.
I have only looked at large hosts mostly because I don't know how to check the quality of the network/peering agreements that a host has. I figure just stay with the big boys and that aspect is taken care of. Obviously that approach has its drawbacks.