So I'm loving my 50mm f/1.8. I'm thinking about another prime lens (after I really learn how to use this one). I'd love to learn how to shoot portraits. The Tamron 90mm f/2.8 macro and the Canon 85mm f/1.8 are both around the same price. I like how the canon has a wider aperture, and it looks a little more solidly constructed. At the same time, the Tamron has macro capabilities and is *slightly* more telephoto. (I do see a lot of nice macro, and that might be fun to learn too). Thoughts?