No, premium cars are available at all times in everyone's game - just go to the New Car Dealership and spend your credits. So they're not sought after, and the prize car tickets that contain them are worthless.
Standard cars are only found in the Used Car Dealership and Online Car Dealership. The OCD contains 0/0/0 cars, ones with no miles on and are already broken in, i.e. have maximum base BHP. The cars in the UCD are standards as well and can range from 0 miles to 100s of thousands of miles. But unless they have less than 200 miles on them, they will be fully broken in. If they have more than 10,000 miles though, the BHP will be less than maximum because cars lose 1hp per set number of miles after 10,000 or so. So a car with 300,000 miles will not have the same BHP as the same car but with 300 miles.
Standard cars that comes from tickets are 0/0/0 like in the OCD, but they are not broken in, they're like Premium cars in this sense, so the same car bought from the OCD and one from a ticket will have different BHP amounts even though they're the same car.
And as for a list of cars that are standard and premium there's two websites to look at
www.mygranturismo.net and
www.gt5cars.net