StudioPress is a top premium WordPress theme developer. They are well-known for their Genesis Framework which powers and is included with each of their WordPress themes. Since all WordPress themes from StudioPress are child themes of the Genesis Framework, they all have these standard features: search engine optimization, automatic updates, custom widgets, theme options, layout options and localization. Most of their themes are ad-ready and all are cross-browser compatible.
You can buy the Genesis Framework and use its many features to build a custom WordPress site from ground up. Or, take advantage of the many turn-key child themes designed by StudioPress (and their marketplace contributors). They offer all kinds of themes that work as solutions for such niches as business, church, real estate, magazine-style sites, bands, education and many others. Whether you use their framework out of the box or take advantage of a child theme, you will gain access to full documentation, helpful tutorials, an active support forum and unlimited updates. Themes purchased from StudioPress can be used on as many sites as you would like.
Take advantage of their Pro Plus All Themes package to get all themes (excluding marketplace themes) for less than $8 each. This includes the Genesis Framework plus unlimited updates. What's great about this package is that it is actually a membership except that there are no recurring fees. Your one time payment includes all current and future themes! Visit StudioPress for full details and to try live previews of their themes.
Premium WordPress theme sellers typically include support and upgrades with theme purchases. Visit StudioPress's website for complete details including the most up-to-date pricing.