Hey I'm from Ask Mr. Robot. You can actually generate custom weights with our simulator which is more thorough than any other source of stat weights.
When you run a 'gearing strategy,' we look at thousands of data points for each stat AND run every trinket and item with a proc through a full set of simulations. When the simulation finishes you get custom stat weights AND all of the items with procs are bundled in that report so when you rank items, it comes directly from those simulations.
The stat weights also let you plan out how far you want to look for gear. Right now? 10 iLevel outs? Further?
To run a gearing strategy:
1. Go to the sim setup page:
http://www.askmrrobot.com/wow/simulator/run
2. Load your character
3. Change the sim type on the right from 'single run' to 'gearing strategy'
4. Change the min/max iLevel in the options that show up. I'd advise NOT to change the margin of errors, unless you are willing for the simulation to take hours instead of just 30 minutes.
5. Click Simulate.
When you're done, click the green 'save and use' button the report and everything, including the trinket simulation data, is imported onto your character gear page