Has anyone used the Nikon 28-105mm f/3.5-4.5D Micro? I've been offered one for a great price (~ US$160). It is certainly an option. I've talked to a FX user and this is his walk around lens.
There is also the 28-80 3.3-5.6 G that has macro and is very sharp and extremely light to carry around. Got mine for $50 and it sits on one of my cameras most of the time.