Get the R3 and get the dura ace, but get a compact crank. The shimano one seems fine, or pick up an FSA SLK or K-Force compact crank. Then use any rear cassette, I personally would do a 12-25 you won't miss the 11 that much on descents.
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Rams Cycling Team
'06 Cervelo Soloist Team record, '04 S-works epic sram and king equpied, '03 litespeed hyperion DA/Ultegra 10sp