Where to stay for the Wulong Karst?

I want to see:
1) Three bridges,
2) Jade snow cave
3) Farong Cave/Lotus Cave
4) Houping Giant Doline

I can either stay in Tongren or Chongqing. Which one is easiest to stay in in order to see all of these. How many days will I need to see all of them. Is there a bus to each one? I will be going to Fenghuang afterwards so I do not mind where I stay as long as I can get a bus there (or to a train station that goes there).