As noted in rgatijnet1's comment, as a seller my recommendation is to require a wire transfer into either a new account or your bank's holding account. Once the funds are confirmed, provide the buyer with the title(not before!).
I've seen every form of check counterfeited. Your experience may be different but, you asked for the safest form of payment.
A few comments seem to be from the buyer's perspective. That's fine but as the seller, you have to be comfortable with the transaction method... wire transfer may be your safest. Cash is great, but I have found myself counting and marking stacks of bills to be a bit of a pain.
Good luck,
Gary
