Phil: I will leave July 1, but if you make it to UB in June, I'd be happy to meet for a  to talk over routes and Mongolia in general.
If you want to do it the fun (aka difficult) way, you should enter Mongolia through the far western border point and drive from there to UB. It is 99% offroad driving from western Mongolia to UB. If you're pushing hard you can make it in three days. A week would make it more leisurely and fun.
The easy way is to stay on the paved roads in in Russia and then come down to UB from Ulan Ude. That way is all paved and you can make it from the Russian border to UB in under six hours.
Let me know if you have any specific questions about overland in Mongolia.
-Scott
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