I have a few 68K Macs, but I still tinker around with 68K emulators. Just recently, I decided to give Mini vMac a try and I fell in love with it. Took a bit to get used to, but I thoroughly enjoyed it. I haven't played with Basilisk II in a while, but I have it to thank for taking me to Mini vMac.

I haven't tried SheepShaver yet, but that one is in the plans.

You might also want to try out some Apple II emulators, as well as possibly some Amiga, Commodore, Atari, etc. emulators.