Sigma 24~70 f2.8 for now though it's big and not a lightweight. That may change as I have a Sigma 17~35 coming and a Sigma 24~135 I haven't had a chance to try yet. To be honest though, I always have one of the Sony's close to the door and tend to grab one of then for spur of the moment outings. Adult ADHD, can't make up my mind and all that...
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Mike Mosher, Native Conch
KM 7d, KM 11~18, Sigma 24~70 f2.8 EX DG, KM 28~85 3.5/4.5 Pony Beercan, KM 80~200 f2.8 APO 'Blackie', KM Beercan, Sigma 400 f5.6 APO, KM 3600 HS(D)
800si, 7000i, 7000
3500xi, 5400HS
Sigma SD-9, Sigma 70~210 f2.8
Sony DSC-f707
Sony DSC-f828