If I ever have enough $$$ for a second, fun car then the BRZ would be at the top of my list. I kinda feel like my current car is fast enough in a straight line. Going any faster will just earn me a worse speeding ticket.
I feel like I want to go the opposite direct with a 'slow car fast' approach. Plus I'd love something more toss-able.
I'd give the Miata serious consideration.