Robin and Murray, thanks. You guys seem to be arguing based on the fact you're talking about apples and oranges. Whether you meant to or not, you've shown me the difference between "Numerical Numbering" and "Nashville Numbering." Modulation happens in the former and usually not the latter. The Nashville system seems to be dependent upon the scale of the song and key, and Numerical is dependent upon the root note of the scale of whatever chord your playing.

Regarding Nashville numbers, I still would like to see 'IIm, because there's still a chance somebody will throw in a II chord. Am I wrong?