I would get at least 3 and nine at the most. Though I would only get them as I could afford them (one by one).
Now ask the question about Uruk-hai.... There's where the pocketbook takes a major hit.
A separately sold sword/armor/helmet-pack would be a better solution for this, otherwise you'd end up with 8 or 9 Figures and up to 81 swords (not counting the knives...).... but it would surprise me if Sideshow included 8 different swords with one figure.