In reply to Tricadam:
So if self-arrest is a priority, the Quarks (for instance) will be better in that regard (though still not great!) with the Vipers not far behind. In terms of how they climb, Quarks do ice very nicely, especially with the added pick weights. Scottish tech 6 fine too. Though both do feel easier with more aggressive tools.
Quarks and Vipers are both popular, so you'd be able to snap up a second hand bargain if you wait around for a bit. Merry Christmas!