In reply to vitas:
For technical mountaineering I would want something with a modular head, so I second the idea of Apex/Quark/Viper etc. Weight-wise, the SumTecs are listed at 495 g whereas the Quark is 550 g. The newest version of the Viper is 570 g and the Apex is the heaviest at 687 g inc. pick weights.
A more expensive option would be a carbon-fibre shaft such as the Cobra or the North Machine.
An all mountain axe is going to be a compromise in one way or another but I would err on the side of adaptability rather than light weight. Trying them out side by side is a good idea too.