Thanks for the replies.

I just glanced through Digi-Key online and noticed that there is no 200uF capacitor value. There is a 180uF and a 220uF...so the values in the range that would be most effective for reducing the bass coming out of the fronts are 120, 150, 180, 220, 270 and 330uF. Doing the math for these results in this (trobertson7 shows the formula):

120uF = 331 Hz
150uF = 265 Hz
180uF = 221 Hz
220uF = 181 Hz
270uF = 147 Hz
330uF = 121 Hz

The reason I am bringing this up is that the difference between the successive values really aren't that much; the audible difference probably would be only slight, but the difference between the 120 and 330 values should be really obvious.

It would be interesting for somebody to try some of these values and see if one value is much better than another. I only ever tried the 220uF and was very satisfied with it, so I didn't try the others. My gut feel is that different people would like different values, so it would be interesting to hear what people are experiencing.