PRESTIGIOUS looks clean and very professional, has a ton of variations

There are two Prestigious themes: Prestigious-A and Prestigious-B (this demosite). The last one has a built-in feature to allow you to just drop your BannerZest banner* into the theme's header.  Of course you may choose to use images instead of BannerZest and that looks great also!
Why two Prestigious themes? Prestigious-A has more Theme Variations than Prestigious-B. Internet Explorer cannot handle so many variations together with a BannerZest flash header. That's why I've deleted some less used variations in the Prestigious-B theme, so a BannerZest flash header in this theme appears in all browsers. But you can add in a Prestigious B page the "missing styling options" in the Custom CSS of RapidWeaver. Internet Explorer is really happy with this option :) It's explained in the ReadMe file. 
Not all pages of this demo contain BannerZest banners. I've put them in some pages and not in others to demonstrate the flexibility of this option. You get to decide which of your pages would benefit from a banner!

Prestigious A and B have a SplitMenu: the first level of navigation is always horizontal and displays at the top of the page.  For second level navigation, you decide if you'd prefer it vertically in the sidebar (this choice allows for further sub-levels of navigation) or horizontally below the header image (this choice is limited to two levels of navigation) 

Some of the Theme Variations:
• 5 different built-in headerimages and the ability to add 10 custom header images, either your own or choose from the 65 extra header images supplied with the theme.
• 11 different transparent effects on the header image and the ability to use your custom effect on the header image
• White or Black Background
• Different Title and Slogan Positions
• The submenu in the sidebar (left or right, with more sublevels) or below the header image (no sublevels).
• Many width options (550px through 960px)
• Many color picker features
• Different body background patterns built right into the theme. 10 are built right in and you can also add your own
• Mediabox installed, it's a new way to load content (movies, flash animation, external sites, etc) in your page

* Prestigious-B is ready for a BannerZest flash header: see this tutorial page by Brian Morgan and visit his "Reference" page to get a 20% Rapidweaver users' discount on Bannerzest or Bannerzest Pro.

I’ve added a BannerZest code to the ReadMe file for a demo flash header (another one than the one on this demosite) to try it immedately after purchasing the themes. Paste this code in the index.html of Prestigious-2, save the file and preview your page…
The downloadfile includes both Themes, a ReadMe file, 4 Accordion Title Images (black and white) and 65 extra header images. But you can use your own images too of course!