I used the stem I already had. The curve and hood placement I used put the hoods in almost the same position relative to the stem that they were on the Pocos.
I don't have the Nitto/Riv/Bridgestone mustaches that Grant Peterson designed handy to compare, but remembering how the ones on Trek's mixte (Grant's) felt, I like the Nashbars better. They are slightly narrower (2 cm), and I do like steel just as a matter of principle. The straights don't seem to flare out quite as much, which my wrists like.
These are ridiculously comfortable and convenient bars. Yeah, after 4 hrs I was getting a little sore and tired, but it *was* the first time I'd ridden with them. I think they will be staying on my commuter. (and drops will stay on my zoom-zoom)
"If Americans want to live the American Dream, they should go to Denmark." - Richard Wilkinson