I definitely want to be able to play the classics (PacMan, Donkey Kong, Q-bert, Dig Dug, Defender, etc.) I also have a warm spot in my heart for some odd-ball classics such as Jungle King, Moon Patrol, Wizards of Wor. However, I know some of those games don't have the same replay value they did when I was an 8 year old kid. I guess I just want a versatile setup that's not too expensive. Also, I need to keep in mind that this is just a "proof-of-concept" for me. I expect I'll have some lessons learned that I can apply to my full-size CP. If I make a mistake in the planning/design of this one, I'll have a second chance to get it right. I just don't want to have to re-buy a bunch of parts because I bought the wrong stuff and didn't think it through.