I found my girl, who happens to be my version of perfection, by using a self assigned standard. I had things in my head that my future partner would need to have as qualities in order for me to consider a long term relationship. So I made a list. I used "Must" or not compromise on and "Would Like" or willing to compromise on as the standards. For instance:

Must have a job.
Must be willing to move, and move often.
Must be financially stable.
Must be submissive.

Would like her to be within a certian age range.
Would like her to enjoy (list activity)

So on and so on.

So, as you run through your head, as you encounter single people, the list of things you've made for yourself. You can use these things to help yourself know if someone is worth the time spent getting to know them or not.

By doing this, you know you're not asking too much, but simply adhering to the things you need within your life in order for you to be satisfied.