I agree with you, Sean. I didn't think about that lens. I am a prime guy, but sometimes I do miss the zoom especially when photograph something not that important(like kids everyday activities which not need thin DOF). a Tamron 17-50mm2.8 plus the sigma 30mm 1.4 prime does sound a very good combo( I already have the 85mm 1.8) since both lenses have very good reviews and saving money always important part for me when decide purchasing a lens.