I recently purchased a craigslist Giant Sedonda SX to ride around the nieghborhood and rails to trails with my sons.We are having a blast and I am surprised how much i really enjoy it.I just hit the big 4-oh so I decided to take the bike out to get back in shape and have been riding most everyday.So much better than running or the treadmill! My normal route is about a 10 mile loop that is mostly paved county road(rough surface) and small sections of gravel farm roads some pretty big inclines.Now my question.I like the sedona, it is a great bike, but as my rides have been getting longer I wonder if a more road efficient bike would be better.Not a road bike but more of a hybrid.Would I notice much difference in say a trek 7000 series or fx series.I also have looked at the specialized crosstrail.I would still need the ability to ride in the rail to trail and the gravel sections of my ride.I have $400-$500budget so the crosstrail or base model treks I mentioned are options> I have found a 2004 7500 and a 2004 giant cypress SL around$300 on craigs list.Would any of these be noticeably better than the sedona if I started to extend the distance of my rides?Thanks for any help provided.REALLY enjoying your sport,wish I would have jumped in years ago.