I'm in the same boat. Also 32. My longest relationship was a weekend fling, and that was also my only 'relationship'. Many girls are, like you said, high maintenance and/or lack smarts. And if they are nice, there's rarely chemistry. I'm looking for someone with a strong personality and sense of humour. In South Africa, where I live, many girls are still subservient to guys and I find that a complete turn-off.
I haven't given up hope yet, but I've decided I'd rather be happy alone than unhappy in a relationship I'll regret.