In reply to JuneBob:
It's worth trying on pairs in a shop until you find what fits your hand, as in my experience that's what drives dexterity. Good close fit around fingers with no/little excess at the tips, fingers long enough to allow full movement. This seems easier to achieve when the gloves are thin and a little bit stretchy.
Personally I have Mountain Equipment G2 Alpine gloves which I find very dextrous as they are thin and fit my hand shape well. I have found warm enough for winter ice climbing (need belay gloves/mitts though) and not too hot for summer Alps. I'd imagine other gloves of similar thickness would be a good bet. I looked at a few others - Rab Alpine Glove for example - which I'm sure would be decent but they were a less good fit on me.
I can imagine they might get waterlogged through snow contact unless you're doing something in the harder grades, and in my limited experience I've found something waterproof and thicker is better for this like the Mountain Equipment Guide/Couloir glove. But less dexterous and quite warm if you're moving uphill...
However they are quite thin so mine got holes from a few (fairly intensive) days of cold Alpine rock climbing/scrambling. Then again, that may well be a problem with any gloves on abrasive rock. Something that is a simple leather work-glove type glove would likely be harder wearing.
Hope this helps.
Post edited at 22:30