If you want kids someday, I'd recommend marrying when you're about 35. Make sure you've banged as many chicks as possible before then. Do all your 3somes and what not now, cuz you won't be getting any of that then. Every girl that is good looking enough and wants your cawk between now and then, don't think twice, just do it. Around 35 is a good time to have a kid. Hopefully you'll be established financially, and you'll be mature enough and appreciate the responsibilities.
Go with an import as far as a wife goes. Better odds it'll last. It's like Honda vs. Chevy, ya know? For the long term reliability, go with Honda.