13 miles on a first adult ride is outstanding. I did .8 miles.

I bought a 7300 for my first bike and the suspension fork came in handy for about 1 mile of the 2700 miles I put on it. The bike did get me riding. The good news is that all the aches and pains you describe are pretty typical of someone beginning to ride. There are methods and bikes that can cut down on aches and pains but they all introduce compromises.The more upright the seating position the more weight on the saddle. The downside is higher wind resistance as you ride faster.Wider, softer saddles feel better in the few first miles. As riding distance increases the extra width begins to cause skin irratation caused by rubbing and numbness as the extra width compresses muscles used in riding.

My point in the above is that as you ride more your taste will change but you need a bike to get you thru the first miles. The bike/saddle I ride now would have been extremely painful in the beginning.

The Crosstown 3.0 is cheaper than the 1.0 and has a solid fork. I like the adjust-ability of the handlebars and the wide gearing it offers. One thing that needs to be addressed is the Local Bike Shops (LBS). For a beginning cyclist, finding a shop that will take care of problems is important. I've heard praise and condemnation of the same shops so I don't know what to tell you to look for. I do all my own service and just accept that I'll have to resolve problems myself. Bicycles do require service and all shops should give you a free tuneup after the bike is ridden 100-200 miles. It's kinda like the breakin service for a new car.