Bought mine via phone and email. Checked with the local mech who built the engine, and all seemed ok. Sent the funds, and made a contract with the seller- if I fly in and decide not to buy, he was to have a cashier's check ready to pick up at his bank, and then drop me at the airport.
Very stand up guy, easy transaction, and no regrets. Just don't be so excited to buy the car that you get screwed.....