I have the ikea set in my house for my niece. It's consistently her favorite thing to do. She also has a plastic disney princess one at home.

I like the tin one mentioned above, that's pretty neat.
I also like the idea of buying pieces here and there, though you might run into problems when buying the actual pot. Our "fine china" we got for $4 for an 8 seat set at a flea market. We use it all the time, no worries about chips or anything. The cups are dainty, a few came with broken handles, so I use them for elegant water cups when I paint. Hee.