Seems like the sweet spot is the Expert. That's a big jump in price to get the S-Works. Perhaps you could just upgrade some of the Expert and save some money.
Here is side-by-side, just the differences:
Expert ($9K)
S-Works ($13.5K)
Stem
Pro
S-Works with mount
Bars
Alloy
Carbon
Saddle
Export, Ti
S-Works, carbon
Groupset
Ultegra R8070
D/A R9170
Cassette
Deore XT
XTR
Chain
Ultegra
DA
Wheels
Roval C38
Roval CLX50
Crankset
Praxis ?
Praxis Carbon
Now, what on the Expert would you upgrade (i.e., worth the money?