Hello all, I am mulling the purchase of a reasonably-priced prime for portraits and general shooting. I would be using on a 5D (possibly upgrading to 5D mk II in not too distant future). I am considering the 85mm f/1.8 and the 100mm f/2. I do not have the budget for or interest in the 85mm f/1.2 L. I also have a 50mm f/1.4 and a 70-300mm f/4-5.6, so I already have the focal length range covered, what I am really looking for is a faster lens for low light and the possiblity of a shallower depth-of-field. Any preferences or alternatives I should consider?