I just have to interject with a little old person wisdom. In my short 22.5 years on this planet I've dated quite a few individuals, and had two long term relationships (4 years and 3 years and counting). I can honestly tell you that it is extremely hard to even know what you want, or the inevitable give and takes of a relationship until you've actually experienced a few long ones for yourself. Of course most people ideally are searching for someone who has it all (money, looks, intelligence, kindness) but in reality it's harder than you think, even as a young, attractive, professional, to come across someone who will actually live up to that in the long term, regardless if they seem perfect in the beginning. After the first year the novelty and 'new-ness' wears off and it's not so easy to accept the negative quirks and traits of someone just because they're paying for everything (male or female). This might seem shallow on a totally different level, but I think it is more important to find someone who is physically attractive and mentally interesting to you than having a strict economic guideline (more or equal salary, etc). What I mean is... if you never give someone a chance because they're a male nurse, firefighter, military man, or any other hard working occupation that you feel is less than you or too much of a 'scrub' for a female pharmacist, than you may be passing up a lot of guys who will make you much much happier in the long run than the wealthy doctor who was so charming and attractive to you at first.
I'm not trying to generalize, but a lot of successful men aren't going to put up with a relationship for long if they're feeling used or as if they're the only one significantly contributing, especially if the wife is highly capable. Guys aren't stupid and they usually know what a girls true intentions are. The ones who are looking for a woman to completely take care of can sometimes end up possessive or controlling... not all but some. Just my personal experience... I'm not an expert.
That said... there is absolutely nothing wrong with a pre-nup. You said it yourself that you're not trying to get "played"... but neither is the person you marry. I wouldn't want to support someone after our relationship failed, but you have to look at it both ways. People work hard for whatever you have, and messy divorce settlements only make it more stressful and complicated. That is one reason I don't really want to get married. Plenty of partnerships work out just fine, if not better when marriage isn't involved.