That Buzz above does look cool. I just moved over to a road bike from an mtb with slick tyres and I'm loving it. Thin tyres, weight, gearing and riding position are beaut! And don't shy away from road bike style handles, I found them weird at first after moving over but they're good. Just spend enough to buy something that has a frame and components that are in good condition and LOOK AFTER THEM once you have the bike. Don't spend money on suspension, for a pavement you definitely don't need it and you will waste energy bouncing up and down on the shockies.
You could go for a few test rides on new bikes from your local shop - try different types (mtb and road) - and then at least you know what to look for when you go and get a second hand one. Also, buy an older decent bike rather than a new cheapie.