It would actually be cheaper to just buy a used N64 and a copy of Starfox for it. It's the same game, only with better resolution since it'll be on your tv.
Too late! I already just got a 3DS (and I'm happy I did). And while I have an N64, my father wants me to sell it any way possible. Plus, I don't have the proper cables, nor do I have Starfox for the system (and my father refuses for me to get used games).
And honestly, I found good differences between Starfox 64 on the N64, and on the 3DS. Enough that makes getting the 3DS version worth it. Now if only it had online play (it'd be perfect for battle mode).