The Kenwood will work. It will probably be a little louder than the sony and will deffinatly have better sound quality.
I would go with the Kenwood, unless your order stuff from online.
www.onlinecarstereo.com has a huge selection car audio stuff and its at a great price.
You might even have a better deal buying the Kenwood there as well.
Best of luck. If you have any more questions feel free to ask.
Btw its better for people to help you if you were to post the model subs you have. This way we can look up what your subs are rated at.
Edit: I matched the rms ratings and they are close. If you wire your subs to 1 ohm this amp should just underpower your subs. Underpower is better than over power. =]
I would run this amp. If you need help wiring 2 dual 4 ohm subs down to 1 ohm the last link will help..
Again, ask away.
I love car audio. Not professional, but ive installed over 5 systems.