Just for a reference to Kentico and others CMS themes, have a look to BindTuning.com
Have some themes for Kentico, all customizable to fit your branding.
You also can try the trials by installing in your environment before buying a theme.
In 30 minutes have a sharp looking Kentico theme installed and running vs. 1 to 2 weeks of custom development.
Have a tryhttp://bindtuning.com/cms/kentico/themes