sh, It reads like you've pretty well have a grip on the wheelset. I like Ultegra hubs, but Tiagra and 105 hubs work just as well while being wallet frendlier. For rims I'd look at Mavic A719, A319 or Sun CR18. The Suns don't have much of a channel and can be a bear to mount a stiff wire bead tire, I've no experiance with the two Mavic rims. I think with DB 14/15 DT spokes and brass nipples you'll have a 20 year wheelset.
Brad