The Klipsch gel Larges are like ML's of most other sizes. The FS black foams are barrel style and are pretty big but the foam gives easily. I'd think if you where a medium of other tips, you'd want larges in these.
The Earportz run big. To hard to say what size you should get. I bought a large pair from another head-fier and they are slightly larger than normally large tips with other manufacturers.