I've been getting into Reaper recently. Most of what I do comes from my hardware, so I record into that either as whole tracks, or sometimes shorter loops (sometimes use Acid to pull these into time if something's not quite right). I much prefer spending money on boxes rather than software.
Am thinking I may have to bite the Ableton bullet some point to strip down for when I can't take all the kit out, 'cos that does hold me back live in terms of transport, even though it looks much better with lots of colourful cables and flashing lights.
I did try a version of Sonar... it played havoc with my machine and left bits of DX plugins scattered all over everywhere which I still cannot stop from cropping up in menus on other programs, even though there I am pretty sure I have blitzed them all...