Well let me start by saying that I am not a subwoofer guy, by any means. I just read what is posted on here by others and point out the other options out their for people looking.
Both of those look good, the only thing I can say is that the three that was posted are a good bang for the buck. I looked up your front speakers and you do want something that can go low and it looks like all the sub can do it. Then again if you are looking to save some money the three subs are hard to beat for $700.
If you can try to pm "The Ear" for his opinion on this matter, he is the real deal when it comes to subs. Also check out "Michael Hurd" beast that he is building.
Just my .02
James
Everything. OK! I'll talk! In third grade, I cheated on my history exam. In fourth grade, I stole my uncle Max's toupee and I glued it on my face when I was Moses in my Hebrew School play. In fifth grade, I knocked my sister Edie down the stairs and I blamed it on the dog... When my mom sent me to the summer camp for fat kids and then they served lunch I got nuts and I pigged out and they kicked me out... But the worst thing I ever done - I mixed a pot of fake puke at home and then I went to this movie theater, hid the puke in my jacket, climbed up to the balcony and then, t-t-then, I made a noise like this: hua-hua-hua-huaaaaaaa - and then I dumped it over the side, all over the people in the audience. And then, this was horrible, all the people started getting sick and throwing up all over each other. I never felt so bad in my entire life. - "Chunk" / The Goonies