Is there anything else but Trek?

LOL, that's a great question - especially on this sub-forum! That being said, the FX series of bikes have a proven track record so the 7.3 is probably a good bet. As mentioned, online shopping is a viable alternative, but can be risky if you don't know much about bikes.

Is your old Schwinn a full-size bike? What sort of components are on it? A tune-up with some new tires and brake pads might give you a serviceable machine that is faster than the Navigator you're currently riding.