Only want a single 12" for a powered sub that has an amp integrated into it. I bought this converter so I can add it to my factory stereo. My budget is $200-250, so what ever you guys think would be the best please let me know. I'm not trying to have earth shattering bass. Just something that sounds good inside the car.

 

If your budget is $250, look at an 8" tube. You're not gonna get a decent 12" for that price.

 

Go to Crutchfield. Did a quick search and got lots of results. Interestingly the sound ordinance powered box for 120 bucks got great reviews! Might give that a shot with your budget. All depends what you want.