i use rockford for components, but id go jl fosho. either a 10w7 or a 12w3. they would both be affordable, and they will rattle your spleen apart. i know the 10w7 is only a 'ten', but it hits harder then almost any 12 ive ev4r heard. its a little more spendy than the 12w3. if you want to spend less the 12w3 is the way to go. now, most people like sealed enclosures, but if you go ported, youll get another 3db out of the deal. thats like doubling your amp power. of course the trade off for this is that you need a bigger box. not a whole lot bigger tho. like 2ft3, instead of 1-1.5. go to local stores and listen. make sure that you like the sound, not the pitch the salesman is running. of course he is gonna try to upsell you. but let him know your budget, and only listen to subs within that budget. i use 2 12 jl 12w3's and a 6w0 6.5 inch sub in the cab.