I haven't used TextMate so take everything I say with a grain of salt. I thought I had read that TextMate bundles could be dropped into Sublime Text with no fuss (source). See tip 11. The tricky thing with Sublime Text is that, as far as I know, the "company" we are paying for the editor is really just 1 person, so leveraging community plugins isn't necessarily a bad thing. Though I do understand that the quality of community plugins can, shall we say, vary, along with inconsistent support.
Anyways, really just wanted to mention the bundle thing. Prior to sublime text, I used VIM/Notepad++ depending on the platform, though I still do use both of those on occasion. This editor provides me some consistency across the various machines I use. Anyways, don't have an OS X machine, so definitely don't know much about TextMate (bundles), or anything else OS X specific for that matter.