Is this purely a "frontpage" brochure/web presence site, or are you going to be managing more than that (a lot of pages, some provided by others, perhaps downloads or images, etc) -- now or in the future? If you think it's going to turn into something a little beefier than just a set of front pages, you might want to look at using one of the content management systems which generally separate content from design, allowing you to change one without affecting the other. There are several good free ones (WordPress, Joomla, Drupal); they require a bit of up-front setup on the server side, but save you enormous headaches in the long run if the site gets big or updated frequently (and especially if other contributors get involved).
If you're just going to be maintaining a few pages yourself, you probably don't even need WYSIWYG, but I realize those sorts of tools tend to present less of an initial learning curve (though keep in mind WYG is often different from WYS, because the tool presents an approximation and users visit the site on different platforms and browsers). I found Microsoft Expression Web
a little easier than Dreamweaver, but that may be because I was a longtime Visual Studio user so my brain already works the way Microsoft expects it to. It has a free download so you can see if that describes you, also. I've also heard somebody enthuse about the CoffeeCup
editor but I haven't used it myself.
Can I make one suggestion: fly-out menus generally aren't necessary unless your site is quite extensive and complicated; in fact, with good design I'd argue they're never necessary. They tend to look a little dated and unless you're careful about which script library you use they can be hard to navigate with touch devices (heck, some of them are hard to use just with a mouse). You'll note TR doesn't use them, and neither do many other well-designed sites (some of which are quite complicated but manage just fine).