It sounds like the general consensus is that I won't really miss the 11t cog in the rear. That makes me think that I should go with the 12-32t cassette from SRAM. When thinking about my commute, I generally agree that I don't really use the 11t very often. I usually use the 13t on one descent in traffic without a bike lane, but will sometimes shift to the 11t. I would think that the 12t is probably sufficient.

Assuming I go with the SRAM 12-32t rear cassette, this chart indicates that the max rear sprocket size is 30t: http://www.bikepro.com/products/shim...r05_table.html. Should I also change my derailleur at the same time or is the current derailleur likely to handle 32t notwithstanding the chart?