I recently went through this decision, and decided to pay more than my original price range to go detached. I found there was also a difference in quality with the floor plans as well that came with the higher price range.
Once USC educated me on what was available, there was no question in my mind that we HAD to go detached. If my financial options were more limited, I would have considered attached, as long as there was an emphasis on privacy. I like being able to come home at night and night and not have to wake the neighbors up. I've already had to come home several nights at weird hours so like being able to go inside without causing a racket.