Help choose a power amp

I have a home system powered by a Denon AV3200. The fronts are NHT VT2's. Watching a movie sounds good, but listening to music is very poor. I am getting absolutely no bass. I don't think the 80w is driving the VT2's. I would like to begin an upgrade process starting with a power amp to power the mains. Man on a budget is looking for recommendations. Thanks for any help.