Campag SR (mech):
Pros - solid brake lever, ergonomics (for my hands), aesthetically I like it the best, can be found for the same price as the others now, dual pivot rear brake now
Cons - thumb shift lever is more difficult to reach from the drops (for my small hands), wheels need a campag freehub.
DA 9000 (mech):
Pros - reviews so far sound promising, apparently have a dual compound hood (like SR now ironically), would probably work well and be low fuss like most Shimano once set up, ability to upgrade to Di2 later if you want (best of the electronic groups IMO), now 11 speed so you don't feel like you're missing anything to SR.
Cons - Kinda boring when you'll eventually see it everywhere.
SRAM Red (mech):
Pros - best of both worlds in term of solid brake lever and no thumb shift lever, LOVE the short shift throws, ergonomics feel good, looks more unique than DA, best priced group
Cons - still only 10 speed and may be outdated soon, looks less classy than SR, no electronic version means you're running top of the line!
Electronic Groupsets: still far too expensive IMO for essentially a groupset that replaces cables with wires. I have ridden it, I know it (can) work smoother than a cable version, but I think it actually looks messier than a cabled groupset and can't see the value in electronic top of the line groupsets yet.