I think part of your problem is your interest in/liking of alternative stuff, as you describe it (hippie people, alternative music, whatever it may be). I had the same problem, and was shocked at how many quality people I started to meet when I started having more married friends and participated in more mature activities.
Places and activities that come to mind where one can meet quality people are: Tennis/Squash, golf tournaments, charity events, high-end gallery exhibition openings, scientific talks with mixers afterwards (maybe join your local ACM chapter if you're in high tech), anything related to real estate or investment strategies (e.g., real estate or investment fairs and talks), Country Clubs, etc. Also, university campuses are of course great if it's a quality university with many graduate students. Sign up for a few email announcement lists for evening talks at a local university about topics that you find interesting.
And, of course, make sure to come across as the kind of mature, reliable, and educated person that the kind of woman you are looking for would like to date! Women love a combination of self confidence and humility in a man, so hold back on your crazy humor and present yourself as a person of integrity and substance.
Good luck!
PS -- I am a marriable woman, and if I try to think where/how one would meet a woman like me or my single girlfriends -- well, either at work (research in high tech), high end fashion shopping, at scientific talks and high tech gatherings (venture capitalist talks, mash-ups, etc.), top universities, quality restaurants, brushless car wash, quality grocery store, nice cafe, out jogging in good neighborhood, often in private friends' homes for family gatherings and the like. Or online.