Ian from NT
I got my H-B from Lymax in the States
http://www.lymax.com/hbaa/
The H-B is great to use once you get a handle on the simple symbology they employ. It also has some detailled mapping of the LMC and SMC which is what you need with a 12" scope.
Matt
I haven't used a UM2000 in anger, but it always seems to appear in discussions about the best atlas out there. I am sure some here have the atlas and can advise you better.