Depending on how much flexibility you have with placement, the M60s may be a better choice as well. Numerous people have said that though the M80's are incredible, finding the sweet spot for placement can be a challenge. On the other hand, the M60's are pretty easy. Plop them down and enjoy.
I also agree, unless you're putting the Ascend 340's up against the M60s/M80's it's not really fair. As great as they are, the little 170's are simply out gunned against big towers.
Good luck, and let us know how it turns out.
