Dude the Def Tech Pro Sub 80 is an excellent choice for your budget. THe Pro Sub 80 out of the Pro Sub line has the best sound it is the fastest of the line. It is musical I use it with JM Lab 906 speakers and it sounds fine. I do not see much use in paying for a more expensive sub because our ears really can not pick up on it that well. It is ported and when you get it loud and have real base heavy music it does have port noise which is to be expected. My budget was 500 and I chose this sub becasue I did not see or hear anything that would be a drastic improvement in the sound for the same price. I did like some subs better but they are out of the range you want to spend. Remember it is a sub. And one annoying thing about the def tech all of them actually and most other subs aroudn is they are signal sensing so you can not turn them off or on it just happens automaticly and even closing a door loud or playing guitar can turn it on. But over all i enjoy my Pro Sub 80.
Erik i am in the same boat you are I got all of my equipment cheap and when i go to a store esp when i was looking for a sub i wanted to spend 500 max and the audio guy was like for your speakers you need a sub that cost at least 1.5k i was like hahahahaha lets see I Mt. Bike, I Rock climb and have other expensive hobbys too. So i understand your situation. Ok its off topic what bike do you ride where do you climb and what all. peace bro Nick
Erik i am in the same boat you are I got all of my equipment cheap and when i go to a store esp when i was looking for a sub i wanted to spend 500 max and the audio guy was like for your speakers you need a sub that cost at least 1.5k i was like hahahahaha lets see I Mt. Bike, I Rock climb and have other expensive hobbys too. So i understand your situation. Ok its off topic what bike do you ride where do you climb and what all. peace bro Nick