I never liked those aluminium speakers or any system with tweeters I can't atenuate. That top end always sounds harsh to me, specially with an Alembic. My personal favorite always were large cone speakers like the 1x15, but recently I bought a Epifani 2x10 and it totally changed my mind.
Some of these new neodimiun Cabs are amazing in their sensibility (loudness), power handling and frequency response. Mine beats easely any Ampeg 8x10 in all those aspects (plus in weight/portability, of corse). I can't say it has a total flat response, but cuting some high drive makes it very distint in the mids and very pleasant in its overall response (never harsh or dull).
May be they're more expensive than the Hartke, but worth each cent. You should try someday...