It's a personal thing, the cars that I use best will not suit a lot of other people whos cars arn't as preferrable to me, and so on. There's plenty of threads about different competionts and events in GT4 so if your looking for advice on a certain event look around for one of them. But to ask what is the best all round car will get a different answer from every member, it's far too unspecific, and threads like this have been made a lot before and proven that point.