I also follow Chi Running ( I had a few lessons to make sure I'm doing it properly!!). I managed to bag a pair of Inov-8 Flite 230 which are really good. They are nice and low to the ground and VERY light. The sole is OK at this time of year but you'd really struggle in mud and down steep slopes. Not too sure what the equivalent Roclites are, I found the 315 "clumpy" in comparison!! I'd like something in between the talons for ultras where some extra grip is needed but not too aggresive like the Talons.
Might try some Talons as well though when my Walsh give up!!