I think service records are more important than mileage - I'd rather have a higher mileage car that had been well maintained over a low mileage one that had been neglected. However, if it was a choice between two cars that were otherwise identical besides mileage I'd take the one with lower miles.
It's always best to buy the best one you can afford...if you buy a beater you'll almost certainly spend more on fixing it up when compared to a car that's ready to go.
