Here's my calculated guesstimate
A 2015 ST3 is $29,050 (no sunroof, no optional wheels)
Add $1750 for AWD (this is how much AWD cost on an Escape)
Add $250 for stronger AWD (added strength for additional power over an Escape)
Add $500 for Torque Vectoring Control System
Add $1,000 for the upgraded motor (2.3L compared to a 2.0L of the ST. Same motor as the Mustang but with better internals)
Add $500 for upgraded turbo/ intercooler
Add $500 for upgraded brakes
Add $250 for upgraded tech (drift mode, auto stop/start, launch control, etc)
Add $500 for bigger 19" wheels
Add $500 for upgraded suspension (stiffer springs, better bushings, bigger sway bars, two-mode switchable dampers)
Add $250 for upgraded seats (possible better Recaros than the ST3)
Total comes to $35,050
This price is assuming the RS comes with all the options of the ST3 (heated seats/steering wheel, nav, back up camera, etc)
All upgrades are over the ST with the ST3 Package. The prices above are not counting any options like the lighter 19" wheels or the optional seats for Europe.
Where did I get these numbers you ask? Well basically I pulled them out of my ass