Well, the "must have" lenses seem to change with the tides for me.
Right now, the "must have" lenses seem to be the DA* lenses. I have the 16-50, the 50-135, the 200 and the 300. The FA50 is a great, fast lens for the money, and the 18-250 is the perfect travel companion when you're travelling light.
For wildlife, I'd say the "Bigma" (Sigma 50-500) is a "must have".
Ah, heck, just buy them all!
