I have bought many tires in the 245-50-16 because its what fits my Camaro. Most tires in that size will have a good speed rating, and if you're not racing on them most will work fine. I've got Sumitomos on the car now simply because they work decent, were cheap, and ride good. I would buy Toyo Proxes 4s again, as a matter of fact thats what is on my Miata currently, it's a good predictable tire for the money. I had a set of BFGs that weren't a great performance tire but they rode good.
Having had many tires, I have sold tires, I work on cars, and even race from time to time I feel like I have a clue. Honestly you need to decide what your biggest factor is. Performance, price, tire life, looks? In that size when you aren't going to drive it much it doesn't matter much, though I would get something that isn't going to ride like shit. Hence why you'd never get me to buy a Firestone, Bridgestone, Goodyear, or Continental. People will argue that those companies make good tires, and certain tire models aren't bad, but most of them suck. Toyo is one of my favorite brands, but if it's not a performance tire they are shit too.
Okay I'm done ranting.