In no particular order – Rin, Blix, Minima Plus, Gespaa and Connections. I based my opinion on the flexibility of the code (well commented and easily modified) as well as overall chutzpah. I’ve used the first four themes myself with various changes on a few sites and found the experience enjoyable and almost frustration free – which is exactly what I look for in a theme.
That being said Holy Moley that’s a lot of themes from a hell of a community. Thanks to all who have added to the richness of the WordPress experience – diversity is the key to life in any community, you’ve made us all proud to be part of this one.
Cheers!