Motoring Investments may be on the high side for some cars but I've also seen them offer cars at much less, I'm not connected in any way with them but that is my observation.... with them like many others I think it really depends on the car and it's condition.....
There are a number of good dealers out there but more often then not a lot of the dealers I've seen advertise regularly on ebay are selling high priced cars that look good in the photos but are nothing more then very overpriced cars that look great in the photos but when you look at them up close in person and examine the underside of the car, under the hood, and the common rust areas and so on you end up seeing problems from worrisome to nightmarish. I saw a car that looked really nice on ebay, it was listed for 35k and was described as a great car but when I went to look at it it was just garbage not worth half that.
You also could very likely find a great car from a private seller, the key is knowing what to look for when it comes to problem areas and being familiar with what it will cost to bring the car to where you want it to be, if you have someone that knows the cars who can go with you or guide you that would be of great benefit. You are fortunate because there are people here that may be very willing to help you.
It also depends on what you want, if you want a car you can work on yourself that needs repairs you can do or are willing to pay someone to do for you that's one thing, if you want a car that looks perfect and needs little work that is another. I personally think it's better to try and find a car that has few problems up front and is in quality condition as opposed to a fixer upper that has many problems. Just because you can do the work does not mean it will save you money in the long run... it may be much better to spend a little more as opposed to buying a 10K car that needs a lot of attention,but again it depends on what you want and where you want to go with a car. You don't need to spend a fortune to get a good car if you shop around and know what you are buying and have realistic expectations.
Judging from the economy this is a good time to buy, I'd wager if you educate yourself on the car, spend time looking carefully at a number of cars, and have realistic expectations you should be able to get a car for a great price these days. My 2 cents.....
Good Luck
Thanks everyone for the info. Motoring investments has some nice ones but perhaps a bit above what I had expected to pay. Does anyone have experience buying from dealers and how much negotiating room there generally is? I know this depends on the car but just want some input. I especially like the silver 67 250 listed for 59K. 
