There are so many great bikes out there. If your bike is similar to the Navigator, it's going to be on the heavy side. My DH has one and it's nice and upright, easy to ride. I don't think the components are that great but he's not out to beat up the bike either.

Have you had a chance to go to a LBS and check out what's available and what you might like? You'll have a great selection and helpful salespeople and can narrow down your bike needs. A lot times they have used bikes. Even if you don't purchase, you'll know what you want and hate when you start looking at used bikes.