Only Albums?

I am looking to make a playlist in iTunes with only artists that have full albums.

I have a lot of single songs, and I want to make a full collection of the artist which only have full discs.

Is there any easy way to do this without going artist by artist? Is there some way to play around with the smart playlists so I can only select artists with 4 or more songs etc.?

Any help would be greatly appreciated.

What I do is specifically mark full albums in the album field. For example, the Beatles 1962-1966 becomes Full_Album 1962-1966 (The Beatles). Then you can create a playlist that finds all albums that contain "Full_Album". Depending on your library size, it may take some time/effort to set-up, but I'm not sure if there's another/better way to do it.