Make him send a check... I've done it for that much here and have sold 2 for less here... paypal and credit card, no way... it really helps to get to know the person.. does he post here on pin side.. can you see where he's sold or bought from others by check?
In my case ever one was a poster here for a while...call the person... and once both parties have confirmed they are legit (you have his address)... then the rest is trust..which I'm happy to say has been a very good experience for me on pinside..
After that contact Michelle at NAVL.. STI has always done a great job for me when handling the machine and properly packing it...
If your current party doesn't want to deal with that.. he can pick it up.. or you can move on to the next customer..