I second the recommendation to try Pilot first, though I haven't used any of their recent disposables. Pilot nibs are just remarkably consistently good. As a starter I'd suggest the Pilot Metropolitan with a medium nib (as Asian nibs tend to be a little finer than European nibs with the same designation) although my personal favourite ‘cheap’ pen (that is, in the Lamy Safari price range) is the old-style Prera (in the US, from JetPens).