Check out Avatar. I've got a 500 watt 2 12" and tweeter cab with Eminence neos, and bang for the buck it can't be beat. The few 2x12 cabs I've heard that were slightly better cost two and three times what the Avatar did. I've never heard their single 15 but these guys build a good cabinet. The only thing I did not like was that they used wood screws to mount the speakers. I bought some TBolt anchors to replace them simply because I'm fussy about stuff like that. I would not hesitate to buy from them again and do the TBolt anchor thing again. Some think it is ridiculous to buy a new cabinet and then modify it, but again, I am fussy about stuff like that, and now I've got exactly what I wanted.
Rick