Organic Themes offers a beautiful collection of customizable, functional and (mostly) responsive designs that are on trend with modern design. While the themes are pricey, you are paying for quality designs, updates and support.
Logging into your account and downloading your themes is a piece of cake, though setting up new themes can take a bit of work. The support staff are helpful and while they work to set US hours they still respond outside of official work hours.
Overall, Milone and Morgan have built a solid business with a strong selection of designs suitable for every need.