The MDDs are perfect bridge machines, They'll boot into MacOS 9 for all your classic needs, they'll boot into OSX 10.2, for AppleTalking to older machines, and they'll do OSX 10.5.8 for running closer to modern software (like that copy of Adobe CS2 you have a legal license for).

Mine has a partition for each. You certainly have the drive space for it. No reason to choose!