I am still using the K2 theme, now revision r791 with the current version of WordPress 2.7.1. I still need to adapt to widgets vs K2’s SBM (sidebar manager). I liked K2’s SBM much better than widgets due to the ease of use, flexibility, and customizability. I will need to hunt down more plugins or widgets to get back what I miss, mainly Pages display control.
For as often as I post, does this matter? A little. Time for some experimentation.