The IRD 10-speed cassette with a Shimano mountain type RD would be a much better choice than trying to make a 9-speed cassette work.
The problem with a mountain type cassette is the big ratio jumps and corresponding cadence jumps from cog to cog. But it you need a cassette with a 32 or 34 cog then you need it. It's really up to your needs. And you could always switch back to a close ratio cassette when needed, the Shimano mountain derailleurs will work with either.
Al
Last edited by Al1943; 01-06-10 at 06:58 PM.