While I don’t necessarily agree with keeping separate checking once you are married (my wife and I have joint checking and make spending decisions together, because we feel it is OUR money), a lot of married couples do have separate checking and investment accounts. Here is an article by Rachel Louise Ensign in The Wall Street Journal discussing it:
http://online.wsj.com/article/SB10001424052702303754904577530710194368918.html
If you have questions, email or call me and we can talk about it.
Remember, You can count on us to count for you! 
email bstonercpa@sbcglobal.net phone 818-317-6035