Does the Nintendo DS have a good selection of Older games?

I grew up on the Gameboy, and I love a lot of the games on there. I'm not really interested in many of the newer games, and I'm not a huge fan of the touch screen interface on the DS. What I am wondering, is if I got the DS, would I be able to play a decent amount of old-school games (Kirby, Wario, etc)? Does the new Eshop have more options with the 3DS? Also, if I got one of the older games, would I be able to play it as I did before with the normal face buttons, or would they incorporate touch screen into it?