"...something that will look great..."
That's pretty subjective. What looks great to me may not to you, and vice versa.
The Team III and other replica wheels are very popular. I bet I saw a 100 cars at the London Cobra Show with those wheels. If you want to blend in with the crowd, that would be my first choice.
For soemthing a little differant, check with companies like Weld and Centerline. I had Centerline make my Billit Thrusters, and I really like them. They are a modern design, with a flair of the old spoke wheels, and a little bit of dish. I've not seen another Cobra with these wheels.
www.centerlinewheels.com