I recommend going to see the car yourself. Your opinion of the car may vary greatly from the owner's opinion, or even another board member that goes to see the car for you. I have purchased less than half of the cars I've gone to look at because the sellers either didn't know what to look for, or were not divulging that information. I know this is expensive, but it is better to spend $500-$1000 to find out the car isn't as nice as you thought/were led to believe and be unhappy with a $50K purchase.
Regarding the transaction, the first thing you need to know is if the owner owns it outright or if there is a lien. If there is a lien, you want to pay off the lien yourself. Do not send the owner money and assume they will pay the lien off. You don't want any ownership issues. Second, in some states if there is a lien, the lien holder has the title. In other states the owner has the title whether or not there is a lien. Find out who holds the title.
Regarding shipping, go to Hemmings.com and check out their transportation page. Check out those links. If you fill out the form on any of them you will be inundated with many offers to ship your car that you can choose from. Some of these outfits offer a service where they will take the check for the car when they pick it up. That way you know that when the money changes hands, so does the car.