I would definitely get a pre-nup if I had more money. Don't want her to get more than her share if it doesn't work. If she has more money, then no pre-nup. This way if it doesn't work out, you can take the goods with you.
Also, you should always sock some away without her knowing about it while you're married. You might need it for strippers, gambling, etc. If she finds out about it, tell her that you are trying hard to save for the 2 of you and that you were going to surprise her with it at some future time. This way if she divorces you, you've got some starting up money when you're done.