Minors is a bit smaller than some of the other centers, but they have an incredible selection and good service. Because they are small and clearly employ people who know plants. you can find goodies there that just wouldn't make it in a big box chain store because they are a bit tender for our spring temps. But Minor's gives them TLC and without them I wouldn't have fallen in love with heliotrope!
They have handy wagons and carts to haul your plants around while you browse the aisles. The protected greenhouse areas shouldn't be missed, though you don't see them from the outside and I didn't realize they had such a vast selection at first. They also do a really good job of keeping everything outside in alphabetical order so it's easy to find exactly what you want, and if you don't see it, they will help you find it by common name or scientific name.