JL Audio makes some awesome subs. They make different models to fit different applications. I am just suggesting that you select your subwoofer based on YOUR needs. Kinda like picking out clothing, you want them to fit YOUR body and not some ideal, regardless of how nice that size 4 "little black dress" looks on the model, I think that it would look pretty silly on my middle-aged male body.
For your application, with 140 watts, I would suggest a JL Audio 10W3v2 or 10W6 over a 10W7 any day. And there are some cheaper alternatives out there as well that would be very well suited to your needs. The ed10 o and k series are excellent examples.