My vote goes to a pair of Klipsch Chorus II's. I own a pair that I don't use anymore but they can put out some serious SPL in the bass dept. You can probably find a used pair for under $500. I got mine from ebay years ago but I'm sure some show up on the Gon every once in awhile.
Each cabinet has 1 active 15" & 1 passive 15" along with two separate horns for Mid/Tweet
Each cabinet has 1 active 15" & 1 passive 15" along with two separate horns for Mid/Tweet