welcome again snp: you could also check with your LBS and see if they offer a basic maintenance course.......most do. I also told the guys at my LBS that I was the one that was going to have to do the work on my bike (which in my case is true) and to please show me what they're doing so I don't have to keep going in there for the little stuff......and they do. Like everyone else said - fit fit fit. You'll Know which bike is right for you: it's kinda like going to the eye dr...you know that feeling when they get the right prescription dialed in?? Bike fit is the same thing.
Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways, champagne in one hand, strawberries in the other, body thoroughly used up, totally worn out and screaming: "Yeah Baby! What a Ride!"