It looks like my current derailleur has room for a 32t cog. Now I just need to decide if I should stick with the 7 speed cassette (I can easily get the SRAM 12-32 and also found a supplier for the IRD 11-32) or upgrade by freehub body to a 9 speed and get a 9 speed shifter and cassette. I'm leaning toward the former, but feel free to convince me otherwise.