Yeah the Global line... i've had much luck with color matching with it.. seems to match better than the others.. although i do say as you that the DBU is better than DBC i was always sold on the DBU unil i tried the BC.
In my opionion the Dbu is one of the best, and as far as mottling goes i've never really had a prob with that in dbu but i have alot with dbc, and some with the bc, i'm still trying to work this prob out,, the last time i sprayed galaxy silver i over reduced my last few coats and it fixed my prob, so we will see if it is consistant..
also what's the secret for laying dbu out really smooth.. i never could get it as smooth as i can the bc