If you are more of a minimalist go for the axis, (i personally love this pack) but if you carry more go for the alchemist...can't tell you about the varient...They all work for what you are describing....also check out the osprey stratos 36/34 these are going to be more vented than the packs you listed.

I do like the Varient very much. Both of these packs are on the same level, straight forward alpine climbing packs. I've found in warmer weather it does not vent well, and with no zippered access to the main compartment you have to pack smart. From what you describe the uses you're looking for I would suggest the osprey kestrel or stratos as Hayden mentioned.