A simple portfolio theme
Price: $25
Stacker is a simple portfolio theme with 3 Page templates, theme options panel, post formats for blog and portfolio and more.
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A fully responsive and clean theme with accessible social icons
Price: $20
Summit has many features, including a blog (it can be disabled), accessible social icons, a portfolio section, a place to add your resume, a theme options panel for customizations, a contact form, and more.
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More responsive themes: Responsive WordPress Themes

Best for freelancers and small business owners
Price: $35
A simple WordPress theme with unlimited color choices, a custom header for single posts and pages, 7 portfolio layouts, footer widgets, theme options, custom widgets ready, and more.
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More children themes: Best Business WordPress Themes

Sleek and responsive
Price: $35
inProfile is a fully responsive theme with 2 skin variations (light and dark), Google fonts, unlimited sidebars, Free JW player, AJAX contact form, background manager and more.
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Clean and modern design with an integrated Page Builder
Price: $35
Good Space comes with an awesome tool to allows you to build pages within WordPress easily.  You may create unlimited sidebars, pick from over 450 fonts, have the choice to pick your own cufon by using a cufon uploader, a theme options panel, 6 Footer Layouts, 4 Blog styles, 15 predefined backgrounds, pricing table, and a drag-and-drop page builder with slider manager.
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More portfolio themes: Best Business WordPress Themes