Frutiger would work well with so many typefaces. Tell us more about the client and their audience to help us narrow it down.

I’m not a designer or anything, and I’m the one writing the proposal. I do web development work, some corporate, and some non-profit, and I’m looking for something that looks clean and modern, but not distracting. This proposal, in particular, is for a web 2.0-ish application for a professional organization. The proposal probably won’t be read by more than three or four people (a mix of technical staff and non-technical stakeholders - lawyers, mostly), but I’d like to make a good impression.

There is a lot of mileage in the Fruitiger family. Because it is a family with versions that provide the necessary contrast for heads and subheads. Stay with Frutiger if possible.

Me thinks keep it simple and use a different width/weight of Frutiger; like if your body is condensed/light then go for extended/bold with a swatch compliment too...

Okay, that’s easy enough. Thanks!