i was in same boat recently but could not find any theme which is not bloat free and writes 100s lines of css in page head so i had to settle with some free theme.
What a great thread! We really needed something like that.
Let me add @visualkicks to the list - his items are pretty rad.
I am also a big fan of @ThemeBeans. Super clean stuff, equally beautiful on the front-end, back end and code editor.
To me, sadly, bloat-free = hard reject on ThemeForest.
I had a really clean, simple HTML template of mine ported to WordPress, however it got rejected for lacking of features. We then proceeded to turn it into a viral video sharing theme that then got approved, but turned the theme in a bizarre thing it was not meant to be.
I am currently battling a review process for a ghost theme being too minimal - however it was meant to be this way. I feel I now have to add unnecessary elements and features to make it ThemeForest-ready.
Refreshing to have a list of bloat-free authors, and give them some praise for not jumping ship into the mega bundle multi purpose powerhouses that only make little sense to build one client / personal website.