In reply to MikeC_000:
"Perfect Winter Climbing Gloves" - no such thing!
IMHO gloves are only part of the solution. When cold, your body will retract blood from the extremities to keep your core warm. So, if you can do a good job of keeping your core warm, the blood supply will be better to your hands - all other things being equal. One of those factors is the annoying necessity of keeping your hands above your head when climbing. This is where going leashless helps a lot because it is far easier to drop your hands and improve blood flow when they're not choked by a leash attached to an axe above your head.
Back to your core - how do you effectively regulate it's temperature so you stay warm but don't sweat to death and get chilled? I don't know the science but my hunch is your body works better when hydrated. I only carry 500ml of water so I try and drink 1.5 litres of slightly salty water (or sports drink) before setting out for the day. Also I wear a bodywarmer (Patagonia micropuff vest).
Eat fat to keep warm. This is the fun bit. As well as muesli or porridge, I eat a couple of stodgy pastries or croissants for breakfast. I don't really do lunch, but in one pocket I have a zip bag of chopped salami and cheese and in the other pocket a zip bag of wine gums to graze on throughout the day.
Finally, the gloves. I think it actually much easier to keep your hands warm when it is really cold, because you don't have to deal with water or wet snow that sticks to everything. Even the most "waterproof" glove will get wet on the outside (possible exceptions are the xtrafit or outdry ones), so even if your hand is dry, the glove outside the membrane is wet and you'll get cold from evaporation. I've found that a thin shell mitt works really to reduce this.
Personally I find that a thin glove that is dexterous enough that you don't need to take it off much (or at all ideally) is better than a thick glove that you have to take off to do anything. (But others much more experienced that me (Andy K) think the opposite and climb in huge mittens and use bare hands for anything fiddly)
Here's what I use:
HH Polypro liner gloves (I've smudged a bit of seamgrip on the fingertips and across the palm for grip and durability) - walk in
Outdoor Reasearch Alibi - dry tooling (not durable)
Rab M14 - dry/mild conditions, dry tooling, scrambling
ME Randonees (not waterproof)- wet/active
ME Mountain stretch - wet/ less active
Ride keprotec overmitts - belaying/ seconding