Pete, if you're using Windows, I wholeheartedly endorse Sound Forge for Windows. I've been using it since the first days of recording my album Sudden Dark in 1995-96. It's the only Windows software I've continued to still use at home in the past decade or so, and I recommend it over any other two-track audio editor on any platform.
I've tinkered a bit with the Mac version, though still not as much as I intended to. It has quite a different feel from the Windows version... a few things have a similar feel, though other things are located in different places. I need to dig out some files in need of editing, restoration and mastering, and force myself to go through all the steps using this Mac version. It would be nice to have no need at all for a Windows PC in the studio, and Sound Forge was the one thing holding me back.