Trust me. If anyone here ever finds a website like that, the link would show up here same day. Our members are very good about that.
I found this site to be very helpful when comparing scoots:
http://www.powersportsnetwork.com/enthu ... &year=2005
That said, I agree with pauljo's suggestion that you first investigate availability and, more importantly, serviceability. In Denver, we have a good selection of manufacturers available (Vespa, Piaggio, Kymco, Aprilia, Ducati, TN'G, Honda, Yamaha, Bajaj, Malaguti and Genuine Scooter Company). So, being an urban and small rider (5'1") my criteria were, in order: style (vintage or modern), displacement (150 to 200), saddle height, weight, and dimensions. My final contenders were: the Aprilia Mojito 150, the Aprilia Atlantic 200, the Burgman (400), and the Piaggio BV200. The Mojito has ZERO storage space; riding the Atlantic freaked me out because I couldn't get used to the handlebars moving independent of the fairing; the Burgman was entirely impractical, as most of my riding is urban. The BV won out for styling, storage space, price, and the location of the dealer relative to my home and office ... and it didn't hurt to know that my scoot buddy had just spent $800 more on a Granturismo with the same engine as mine.
Two more comments, on the subjects of weight distribution and the roads you mentioned. I found the Granturismo to be what I term bottom-heavy; the distribution didn't feel as even as the BV's, making for a huge difference in ease of setting it on its center stand. (My scoot buddy is 5'6"-ish and 160 or so, and she struggles with it every time.) As to road types, I wonder if a smaller-wheeled scoot would be better for the country roads. Seems logical that you'd want more tire -- and thus more control -- in contact with the road surface, which a little tire would provide.
Good luck with your search.