Good lord dont buy a Lanzar. And to be really honest, surprised that kenwood lived that long... lol
Almani is an alright brand. Never used them, but know a guy who deals with them. he says they are ok for budgets.
Cadence is alright on the budget side. Sound slike your looking for 600 WRMS X 1 @ 1 Ohm to me, and thats what i would look for or there abouts. using a Class A/B for subs is ok, but it costs int he way of Amperage and of course $$$$.
So look for a Class D.
http://www.cadencestore.com/ProductC...idCategory=125
TXA-750D looks like a good one when it comes back in stock. I thinkt hat price is shipped too...