I\'ve got some experience using haml (+sass) on rails projects. I recently started using them with blueprintcss - the only thing I did was transform blueprint.css into a sass fi
Compass looked like a great solution for me as well, but after trying it on a project I didn't really see the great advantage of using it for me. Like you, I'm just fine with blueprint, and I didn't see the need to add yet another layer on top of haml/sass.
I eventually stripped the compass from that project and just go with a sass version of the blueprint CSS files, and go from there. I store any custom/additional styles in a separate sass file and that's it. No need for compass or anything like that if you just want to keep it simple.