I currently ride an old Bianchi but am looking for a new bike. I like to ride 3-5 days a week for 2-3 hours a day. My favorite ride is in the canyons or hills but I like any long ride that's beautiful. I'm looking for something in the $3,500 - $5,000 range. I'm interested in Serotta, Seven, Scott or anything else that you recommend. I like a good stiff bike but very light also. What do you recommend?