Keeping it within the stated budget.
100 f2. Awesome lens - bokeh is comparable (i.e., equal) to my 135L, and it's incredibly sharp even at f2. Another option would be a macro lens 100 f2.8 (or for crop bodies, EF-S 60, my favorite lens on a 30D). I find the 85 1.8 is wonderful, but the bokeh can look a bit distressed (not 50 1.4 distressed, but still distressed).
My 70-200 IS has ok bokeh -- 24-70 a bit better (and is cheaper). But if you want bokeh, a prime is the way to go.
--
Brian. Too much stuff; not enough stuff.
100 f2. Awesome lens - bokeh is comparable (i.e., equal) to my 135L, and it's incredibly sharp even at f2. Another option would be a macro lens 100 f2.8 (or for crop bodies, EF-S 60, my favorite lens on a 30D). I find the 85 1.8 is wonderful, but the bokeh can look a bit distressed (not 50 1.4 distressed, but still distressed).
My 70-200 IS has ok bokeh -- 24-70 a bit better (and is cheaper). But if you want bokeh, a prime is the way to go.
--
Brian. Too much stuff; not enough stuff.