Alpine, kicker, jl, planet audio, ma audio. I've had it all including a few other brands (mtx, mb quart, image dynamics) and the best bang for my buck by far has been planet audio. I currently am running 2 planet m2 series dvc 15's with a planet bb1250.1 amp and planet components and 6x9's with a 200.4 planet 4 channel with a pioneer premier head unit on 4 gauge wire and a yellow top under the hood. The setup ran me roughly 1100 and beats harder than anything else I've had for that price. It's very very loud and with the component setup I have I can still hear every word through my mids/highs. Dont waste money on something because of a brand name. JL and Kicker are dope but you are paying for brand more than anything else... I have seen just as many people hit a 155db or higher with middle of the road brands as any other major brand and 90% of the time they paid half the price. Dont go buying jensen or sony and be expecting anything huge for your dollar though. I'd also stay away from lanzar, road gear, pioneer (subs, amps), or anything else you could pick up at wal-mart for that matter.