Those Dayton amps seem pretty junky. The "1000 Watt" Dayton sub amp, which I place in quotes, can't produce over 580 watts according to 3rd party measured data. So I would not expect much from that "500 Watt" Dayton sub amp.
The O Audio 500 Watt BASH amp is an acceptable choice. It produces a true 430 watts, is lower cost than the Dayton and is made better, and made in North America. The O Audio also has the required subsonic filter and it has a parametric EQ band. You must not use a moderate to high powered subwoofer for HT without a subsonic filter. A high level sound effect under the port tuning frequency could potentially cause the voice coil former to slam into the back plate of the motor causing severe damage to the driver.
http://www.oaudio.com/500W_SUBAMP.html
Of course, the Kappa Perfect can take over 2x this much power with music, but it will still give very good performance with the sub.
-Chris