Well, the old 20g one comes with a remote- when I say old, let me clarify that..
Generation One- 5, 10 gig units.. No remote, thicker than the newest ipods
Generation Two - 5,10, 20 gig units.. The 10 and 20 gig units come with a remote and the 5 and 10 gb units are a bit lighter and thinner than first gen units.. The 20 gig is the same size (bigger hd)..
Generation three- new design.. 5,10, 20, 30 gig units.. Remote with 10,20, 30g units. Slimmer / lighter than the gen. two but not by much.. The biggest feature is the addition of a dock that allows USB 1.0/2.0 support. Rumor has it that there's a "popping sound" between tracks - should be fixed via firmware updates but why risk it?
My advice - Get a 2nd gen player..