If the V70 has reflector lamps, I wouldn't use an H9. H9 swaps are generally okay for projector-based systems, and are often not okay for reflector-based systems. Reflectors just don't have as tight a control of glare and light outside the beam pattern as projectors do.
I would use H11XVs, Sylvania Xtravisions. I have found that they offer the best bang-for-the-buck in terms of improvement for your dollar, and don't present a huge decrease in lifespan.
Most of the parts on Rock Auto for a 2006 V70 show H11 for the low beam and H9 for the high beam. They do list a Wagner HB3 for the high beam, but they also list a Wagner H9 for the high beam. And every other listing for a high beam bulb is an H9.
We have the Nighthawk Platinum H11s in our Acura MDX right now, and they do offer a significant improvement over the Xtravisions that were there before. Rock Auto shows them at about $26 for the pair, which is a decent price. They won't offer long life, but will be one of the better bulbs you can buy in this specification. The Philips Xtreme Vision is probably the best.