I saw Hammers last month in Portland, and it was awesome. Perhaps the best set I'd seen from them, which is probably blasphemy, since I saw them twice before with Scalzi. Hard to think anyone could be a better frontman than him for Hammers, but the new guy pulled it off (in his own way, of course).
It seems like they would be a pretty good pick for ProgPower. I don't think they'd draw big numbers (though they got 50+ out in Portland on a Sunday night), but their critical-darling status and general lack of touring would be a good way to expand the ProgPower market in a slightly different direction, without offending any of the legacy core. I don't imagine they'd be too expensive, so they might be a good bang-for-the-buck thing.
Neil