I know a few offhand:

Mercian
Bob Jackson
Richard Moon
Tom Teesdale
Waterford's less expensive adventure cycle (T-14)
Bruce Gordon (he makes customs as well as stock tourers)
Cherry

I'm sure a few people on the FBQ also provide skilled work for reasonable prices, but I haven't researched them all. Regardless, if you care to look, you'll find what you need out there.

http://www.bikeforums.net/showthread.php?t=104966

I think the Atlantis is a wonderful frame, by the way. I'm not trying to slight them. I just know that for people with a more limited budget, the possibilities are not limited to one company or bike.