People are using serif fonts for web text more these days, no doubt due to higher resolution screens.
Korinna would go well with Benguiat.

Thanks Nick! Korinna looks like an interesting solution--and like it should be good for use on screens large and small. Before I started reading on Typophile, I never really considered how much the selection of lettering could affect the presentation of a product or business. It is interesting to me that so few people seem consciously aware of the impact of lettering and yet I believe a large number are greatly affected subconsciously. I think the choice I make here is an important one and your assistance is much appreciated.

Wether one should use sans for screen depends on your target group. When they still have SVGA monitors and older versions of Windows, I’d say yes … ;–)

The number of pixels on an iPhone 4 retina display is about the same as an SVGA Monitor. The screen is smaller, but the users tend to read it at a smaller distance. In the 1980s viewing distances between 50 and 60 cm were advised. Smart phones are held at about 50% of that, I’d say. CRT monitors used to flicker, flat screens don’t. Above that, subpixel rendering suggests a resolution that is 3 to 9 times higher than the physical resolution of the screen. Deciphering small details as may occur when reading, has become far less cumbersome than in the past I think. Therefore, typefaces that have serifs and a thick-to-thin contrast which resembles that of regular body text typefaces as we see in books, newspapers and magazines perform very well on screens these days. As you suggested, we are (again) in a situation where the rules-of-thumb from the past have to be reviewed and revised.

Thin hairlines and thin serifs such as they are often found in skinny versions of Bodoni and Didot or poor versions of classical typefaces such as Bembo and ITC Garamond light should be avoided for reading text though. Especially when sizes are relatively small and texts tend to be rather long. But in that context we did not like those skinny faces in printed media either didn’t we? ;–)

> A company logo is still to be designed...

It's premature to be picking fonts if the logo hasn't been designed yet. (Unless you view them as temporary fonts that might change later). You say that "the present product logo uses Benguiat", but that doesn't necessarily mean it's the best choice for your company logo.

Your entire identity system — logo, fonts, color palette, website, printed materials, packaging, signage, etc. — need to be designed to work together.

> I'm not a graphic artist

It would be money well spent to work with one. If you have a tight budget perhaps a graphic design student at a local college could help for a small fee.