Let me start off by saying hello to everyone. I have been lurking around here for weeks and have found this site to have an immense amount of knowledge. I have not been on a bike since my late teens (BMX), except for the once or twice I borrowed my fathers Trek navigator (I didn't like the upright position).
I want to stay in the 300-600 range.
My main reason for wanting a bike is for fitness first (I have recently lost almost 30lb and want to get fit) and leisure second. I am 31 and 186lb, 5' 6" so to the best calculation I found online I should need a 15" frame...? The LBS didn't do any type of sizing he just showed me a 15" off the bat. I am kinda short so I don't hold that against him I will be using it 90% on paved surfaces and 10% on dirt trails & gravel. I live in Fort Wort, TX. so there are plenty of paved places to ride.
I have found these bikes to be similar but would like to know the difference. Also if you have additional bicycles you would suggest for a beginner please do so I'm open to all the help I can get.
Trek 7.3 FX
Jamis Coda Allegro 1.0
K2 Astral 3.0
Scott Sportster P4