It's your call, you can get this exact same marker for $63 (and that's on the higher side of the price range, but that is just the gun), but it's discontinued.
Here is the package that you're probably getting (also discontinued). You'll probably end up getting a new mask anyways (that one will more than likely fog up on you and you'll get frustrated and buy a new one).
You can pick up the newest Extreme Rage ER3 (basically the newest piranha) for $70.
Either way, if you pick up a new piranha (the ER3) it will provide a lot longer life than the used one (which might need a new sear or hammer if it's been used alot, not that those cost much, but it's not something you want to do).