Gosh, the Grumpy Old Men have been let out for the day. Good Morning, Tim.
If you're interested in a fast 90, the pre-ASPH 90mm Summicron is good value at around £600 for a good example, for example, from ffordes.
Keep in mind though that both 75mm and 90mm focal lengths are difficult to focus when you are shooting wide-open, so a viewfinder magnifier (or else a camera with the 0.85mm viewfinder magnification) is a real plus.