In reply to esoteric:
Have been using Arc'teryx gloves for years.
Their alpha SL glove is ok. One thing I find with Arc'teryx gloves is that the opening for the hands are not so big and almost disproportional to the glove size. Makes taking some of them on and off a bit of a hassle, so watch out for that.
For ice climbing I use the Teneo gloves now, which differs only slightly from the Alpha SL. I have two pairs, one for climbing in and one stuffed inside my jacket keeping warm until they are needed. If I expect water then I have the Beta AR shell glove to wear over the top.
As for the Teneo, I thoroughly recommend it had two seasons out of mine so far and they still have the same shape and show very little wear. I find they are dexterous enough for handling ice screws and carabiners easily and warm enough to handle most temperatures, providing you don't get wet.
They also are fairly trim fitting which means they don't get caught in carabiners when you're clipping ropes etc, which I find happens very often with thicker gloves. The adjustable cuff is comfortable under a jacket and is low profile enough to not interfere with mid-layers. This also means that they work well as a liner glove underneath a shell, which was the original reason for me getting them in the first place.
With the sizing, try a pair on if you can and also consider getting a size smaller than normal. The articulation is excellent but you also get masses of dexterity with a smaller size too by not having excess at the finger tips, all depends on the shape of your hands and what you feel is comfortable.
Whatever gloves you do buy, get two pairs. It's pricey but totally worth it.