I have purchased two NSX's from another state in the past year. Below are my experiences....both of which went very well!
1) 94 NSX in Los Angelas: I am in Phoenix so I drove out and looked at the car. Liked it and decided to buy it. Drove back to Phoenix that night. Next day I caught a flight back to LA and met the owner at the airport. We went to my bank which happened to have branches in the LA area. Had the banker cut a cashier's check while the seller watched. I then drove home with the car! Had a blast driving it!
2) 00 NSX in Sacramento: Too far to drive from Phoenix just to take a look at a car. Too expensive to fly as well. Seller would only accept cash. I didn't blame him. I had the seller e-mail me tons and tons of photos. The guy was the only owner, the car only had 13k miles and the photos were perfect! Seller seemed very reasonable and in no rush to sell the car. I ran a CarFax and it was clear. Obtained a one way flight to Sacramento the next day, along with tons of cash, and purchased the car. There was so much cash that we took it to his bank and they ran it through a counter as well as examined it for authenticity. Again, don't blame him! Bought the car with no issues whatsoever! Left his house at 6 pm. Had a blast driving it home...made it from Sacramento to Phoenix in eight hours...zoom, zoom!
Now, let me tell you what never to do! Do not ever show your car during the day and not be able to settle on a price with the buyer. Then, sometime after 6 pm or on Sunday, the 'buyer' calls back and says, "Okay, I'll pay what you want. I have a cashier's check all ready to go and will be at your home in 30 minutes to buy it." Buyer shows up and hands seller a cashier's check. Seller takes check and signs the title over to the buyer. Buyer drives off and all is good...or is it? Likely not! You have no way of verifying the cashier's check when the banks are closed. Be very careful and never accept a cashier's check without taking it to the bank to verify it is legit and the funds actually exist in the buyer's account. Then, while the buyer is there, cash the check and get the money.
Now, if you bank at the same bank as the buyer, be aware that the buyer could cancel the check after taking the car and the bank will remove the funds from your account to make the check clear.
Personally, I will not take anything but cash or a cashier's check from a bank, other than mine, and I cash it right there and then. Too much risk for me any other way!
One last note, carrying a ton of cash through the airport is no big deal. Just put it in a carry-on bag that has a heavy shoulder strap. Then, when you get to the TSA folks, tell them what you have before you walk through the X-ray area. TSA will take you aside, wipe your cash down for traces of narcotics, copy your driver's license, call the airport police and ensure you are not a documented criminal, and you are on your way! Took about 10 minutes and everyone was very polite.
Just to be safe, I took my bank withdrawl slip, printed the photos of the car as well as the Craigslist ad and took them with me. I did this in case the TSA or police began questioning me on what I was doing with the money, where I got it and why I had only purchased a one-way ticket with no luggage. Remember, both the police and TSA can seize any large amount of cash they find on someone who can not justify why they have it while in the airport. You will get it back but only after you go to court and can demonstrate it was yours. I thought taking all of this purchase documentation was a good idea in case I began getting questioned about what I was doing with such a large amount of cash. Never came up however!
I used a escrow service to sell a couple of big ticket item and it worked out good.
a Third party ie. escrow.com will hold the funds.
Buyer. submit funds and the funds are verified by the escrow. Buyer get the funds back if the product doesnt show up or it is unacceptable.
Seller. Is guaranteed the fund once the product is accepted by the buyer.
I would be worried if the seller doesnt want to use a escrow service.
It is a small fee but well worth it.