In reply to zimpara:
Agree with Graham - generally, for grade breakthroughs, you want a route with bomber grear so, if things don't go to plan, the only thing hurt is your ego.
The best way to get a HVS head is probably to do lots and lots and lots of VSs, on different rock types, in different environments. When you're going well, deliberately pick a few that are right bastards at the grade. If you've got them safely under your belt, pick a few well protected HVSs and give them a go.
Be safe. Good luck.
Mick