I bought a Volagi last November. The bike would normally come with Ultegra. I had the LBS switch out the handlebars for CF, change the shifters to Campy Chorus and the RD to SRAM X9 for compatibility. I also have an 11-32 cassette. I put on a stem with a bit of a rise, but I'm going to a 100mm stem as I get used to the bike.
After I do a tough-ish 100K in June (6000' of climbing), I'll figure out whether I want to either put on a triple or just change the cassette to 11-36 which we have on our tandem. Since the RD will handle the 36t that is a much cheaper alternative; I don't ride in pacelines so the steps between the gears is not a big deal.
I don't really ride the single enough to consider updated rims and I'm not sure the selection would be great as I would want rims without brake tracks (the Volagi is disc-equipped)