Base it on lowest mileage, newest vehicle, best condition at your budget.
Get a short list
Then see who is the best repair agent around you and get the one off the shortlist that fits with them.
At the age and mileage you will be getting for your budget you are going to need someone that knows how to fix it first time at a reasonable price.
Alternatively buy the one you want and pay a fortune to a main agent for an R&M.