I've been using Smultron as my add-on IDE for a long time. It has all the features I need: lua/xml coloring and saving sets of files as projects. But it has a problem: the files at the sidebar cannot be arranged by folders or groups, which can become quite messy when working on projects with many many files.
So, does anyone know an editor compatible with Lion that has this 3 features? I've looked at the wowwiki list, but the only one which appears to have it is TextMate. And I don't want to buy it before being sure it fulfills my needs and that there is not one better (or cheaper) out there.