Like Tarsando said, if you buy used you don't know what conidition it's in until it's your problem. If you get new, it's a known commodity. Plus you'll get any applicable warranty with it.
You may also want to consider if you can build a lasting relationship with the distributor (maybe you already have?) and what that is worth to you...
You may also want to consider if you can build a lasting relationship with the distributor (maybe you already have?) and what that is worth to you...