I've been thinking Goldwater or Jim DeMint. I still think they would be fine. However, after reading till the end I think Rand might be the best choice.
1. Rand will get even more publicity. Good for his eventual run for presidency.
2. The Paul/Paul ticket will get a lot of publicity for being a father son ticket.
3. Rand knows how to speak Conservative AND Independent.
It wasn't until just 20 min ago did it hit me there was a Paul family conspiracy to create a dynasty of freedom in America

It's like Bush Sr. and Bush Jr. except without the criminal element.