World map for D&D campaign

[lyger]

I've been trying to organically build a world for my next D&D campaign, but after a bit I decided I'd rather have a proper geography to work with first, and let the geography inspire my history and cultures instead of the other way around.

So really, there are almost no parameters for this. I have a veeeeery rough sketch that includes the two main features I want for the world map, plus some random completely optional suggestions. I mainly want a world with a lot of variety, so I can have a campaign with a lot of variety. Other than that, I leave it entirely to the cartographer's imagination!

I'm afraid I don't know what the usual going rate is for a world map, but I think I have the budget to spare, especially if this is something I'll be using all campaign. As is probably obvious from the above description, no text needed (heck, I haven't even named the world yet), just terrain and biomes. I plan to add place names as I come up with them, and I'll probably keep coming up with more places throughout the campaign.

Edit: It looks like I can't PM yet, so if you lovely cartographers could provide an e-mail address that'd be awesome.