I am a huge fan of WooThemes.
When I was just getting into WordPress they were the first premium theme developers I came across. And when I decided to launch my own blog in June 2011, my theme decision was a shootout between Thesis, StudioPress and Canvas — Woothemes’ “flagship” theme.
In reality, it’s been adapted by many (myself included) as more of a framework than a plug-and-play theme. Whilst my blog’s original design was somewhat vanilla, I was able (with the help of a tame coder) to mould it into something a little more unique over time.