Here's the best summary of the features - you can click each model.
Scroll down and there's a comparison.
The price difference is large - $7,500 between models - so if price is a concern, stick with the S - lease or purchase (there are current lease deals... if you can find one).
For $7,500 in SX (non-prestige) vs S you get quite a lot - real leather vs SOFINO, 10.25" screen vs 8.0", LED headlights / taillights vs. projector, dual sunroofs, power liftgate, black wheels, etc.
You could also consider the EX if you're okay with a bench seat - you forgo the LED headlights (can replace later) and dual sunroofs, but you get a lot of the other extras.
The S interior is very nice - just have to decide if the features are worth the $$$.
As far as the faux wood trim, it is more of a grey color in black and grey interiors. Personally, I really liked the elegance of the grey interior EX. In the butterscotch and dune brown interiors, it is a little more brown.
There's a thread on this forum titled "S Owners Any Regrets" and I didn't see many - though folks wish it had a power liftgate.