I have those subs, And yes Rockford Fosgate makes good subs and amps, I think I paid around $110 for the subs and made my boxes (sealed) but they work ported as well, so overall $80 might not be too bad with a box.
The reason I chose those subs was the price was good, and my ears liked them, I listened to alot of subs and I just like the Fosgates the best for what I could afford at the time, would of liked the P2's but it was just out of my price range at the time so overall I am very happy with them.
06 Sport Dark Shadow Grey 4.0l
K&N drop in, Scanguage II, Explorer Domelight and ohc
Magnaflow 2.5" catback, metal tailgate handle from graniteguy
Ultra Mongoose 178 rims 16x8 with Toyo Open Country AT II.
Cranked torsion bars
Kenwood head unit, 6.5" Kenwood Excelon components, Rockford Fosgate 10" sub, all powered by 2 Alpine amps.
coming soon: Bilstein shocks , Wet Okole seat covers.