I'm in the process of repairing a blown 18 that I've been using with a 4x10, and as a substitute I'm using a 15" monitor we had sitting around. I love the extra punch I get out of this size of speaker and would like to trade off once the 18 is in working condition. But I need help: there're tons of brands out there, and I need some input so I can narrow down the cabs to try at my local stores. I'm keeping the 4x10, so I don't want to go the 12" route; I'm set on a 15. So who makes the longest-lasting and punchiest one out there for a decent price?