For those who have a hard time justifying owning a second guitar:

I firmly believe that any acoustic guitarist who doesn't limit his playing to strictly bluegrass or rhythm guitar roles needs a decent small-bodied guitar as well as a D. I speak from personal experience. After 25 years of playing on nothing but dreads I picked up an inexpensive 00 and quickly discovered that I could do things on it that just don't work well on a big box. I also found that the tone of a smaller-bodied guitar seems to fit my voice better than a D. I quickly became addicted enough to shell out for a Santa Cruz OM which is now my primary axe. The only time my D-28 or J-45 comes out of the case is if I'm going to be playing in a session where maximum volume is an issue.