It's possible your firewall is blocking the connection. If you use windows firewall, make sure you have an exception noted for Java or IE (or Firefox, Chrome, etc.). Otherwise, I would consider using a different browser to see if that solves the problem.
Since both GM and Chrysler went through bankruptcy, you might not see either around much longer. I would say the Camaro has a better chance of survival after the bankruptcy than the Challenger.
But in response to your question, definitely the Camaro. I think the Challenger looks hideous...