My personal approach on bars has as much to do with the seat on the bike as the bike itsself.
The origional Northroad design I have on my vintage letour tourist (which has a B66 sprung saddle) are ideal for that bike and for upright riding. (I can ride for hours on the mag trainer with this setup but on a traditonal drop bar setup my shoulders are done in 90 min and with a flat bar,even sooner)
However; the uprights wouldn't work well with the E3 Gel saddle and the position it requires a rider to take.
I put an E3 on the GT city bike which had a titec hellraiser on it and found it uncomfortable. With the origional flat bars on the bike the riding position seemed far more comfortable.
I'm not sure what they're called but I saw one of Performance Bicycles bikes on line(catalog) with an almost triathelete style bar (but with a shorter reach)that I might be interested in.
Caveat being; I don't want to be changing out shifters and brake levers with every change.