well, for a literal, "all around lens" i would say either of the Nikon or Canon's 18-200 IS/VR lens. OR one that I like that even takes the cake of those would be the Tamron 18-270 VR lens. Priced closely to the other, but you get a little extra out of it, its really sharp all around too. There may be a sigma thats close to it as well but I'd say check out the Tamron.