The first solo I ever "learned" was "Nothing Else Matters" by Metallica. By "learned" I mean that I basically got the notes right, but it never quite sounded the same as the song.

Anyways, that's a "medium" solo, I guess. Actually, I don't really know what you mean by "medium". Do you mean medium in difficulty? That's what I would assume.

How about:

"Let it Be" - Beatles
"Don't Look Back in Anger" - Oasis (basically an extended version of "Let it Be")
"One" - Metallica (the tapping part is pretty easy)
"Time" - Pink Floyd
"Mother" - Pink Floyd
"Stairway to Heaven" - Led Zeppelin (the first little bit, at least)