Go to (link at bottom) and make a copy of the sheet to input your own stats and calculate how best to spend all those idols. It will tell you what levels to set each talent at based on your current EPs, cooldown trinkets, crit chance, and unspent idols.

Big thanks to /u/nezmito who posted a less fancy version a while ago. They get all the credit for figuring out out to decide which talent to buy next. I just automated it and added a few features I wanted.

PLEASE, let me know if you find any bugs or have a feature request. I plan to maintain this for as long as I play the game. The reddit thread (which I am more likely to see replies to) can be found here: https://www.reddit.com/r/lostidols/comments/4489ak/finished_version_one_of_my_automatic_talent/

Calculator:
https://docs.google.com/spreadsheets/d/1I-EK0jLRbOR__h46oYfT-ewKA7DQ7hregp2k9RasoW4/edit?usp=sharing

assuming blue (h) is current efficiency and (g) is most efficient next upgrade

ok here are my calculations using your calculator -

84804 - current

101745 - calculate current with more idols available

97291 - re-spec

So a re-spec doesnt appear to be optimal