Which pregnancy tests are the most accurate at early detection?

Jessica • Positive pregnancy test on September 16, hcg test at 600. September 18, up to 1300. Due May 22, 2015 with boy #3 - Ares!
I have used different brands, and I don't have a particular loyalty to any of them. The addage, "you get what you pay for" hasn't always been the case with pregnancy tests. What are all your favorites and why?