I use DOSBox on a PowerBook G4 (PPC Processor) and on a Mac Mini (Intel Core Duo). It was really easy to install and it works smooth on both machines.
For modem connections, the directserial feature of DOSBox is needed, and this is currently deactivated.
I had a need for modem connections and therefore I recompiled a custom version of DOSBox with directserial support activated.
Dial-In Connection with the internal Modem using DOSBox @ OS X
Compilation from CVS is of course not an installation as easy as doing it by drag and drop. But, the big advantage is, that with that modem connections do simply work with Mac OS X.
Contact mangers need correct times and dates, right?
Since you are going to buy an Intel Mac, the following problem might not be so dramatic, however at a PPC Mac the RTC clock of DOSBox deviates very fast from the real world clock - it is late more than 10 second per minute. In addition DOSBoxes at all operating systems suffer from the "date update at midnight" problem
For both time related issues there was a patch for DOSBox 0.65, but this did not made it into the mainline, and I do not know how easy t is to get the patch working with the current DOSBox version.
Best regards
Rolf