I have 2 6100's. A PDS video card is the best way to go since it is fast, has much more RAM for color depth and video resolution, and it has the more common mac video connector. One of my 6100's has a PDS video card, the other has the Apple 486 DOS card along with an adapter and octopus cable to get it all to work.

While I don't love the 6100, I don't dislike it enough to junk it or give it away either. The form factor is kind of neat I guess, and I like the DOS card setup.