Reaper is awesome! I did a bunch of research before buying a DAW and Reaper struck me as the most principled and generally well-designed option among those I found.

It's very powerful, which means there is a bit of a learning curve, but it can do everything you want it to, and it has nice stuff like really solid scripting support (lua, python, and some DSL).

I record like 20-30 audio tracks at a time from my rackmount setup and reaper handles it no problem.

Very much worth the $60.