I'm a roadie, and usually average between 19 and 21 mph on my rides. Last year, I bought my wife a Schwinn Sierra GS aluminum comfort bike, in an attempt to get her on the road. It worked. She loved the comfort of the bike, and has been putting in about 60 miles a week this summer.
However, I became really nervous when she signed up to ride an MS150 with me. You see, she'd been averaging about 10 mph, and I didn't know if I could even survive nearly 8 hours in the saddle at that speed. However, I was committed to staying with her, and providing encouragement and support.
I thought about changing her tires to slicks to pick up a little speed, but then decided to go all the way, and get her a Trek 7500 FX hybrid (although I added a suspension seat post). What a difference! The bike weighs 23 lb, has Rolf wheels and Bontrager tires, and she's now averaging nearly 14 mph! A couple more weeks, and she might be kicking my butt!
Anyway, the Trek 7500 FX is a great ride, worthy of your consideration if you're looking for a light, fast hybrid.