I was browsing Alumacraft's website and noticed the Sierra series jon boats. What sets these apart from the regular rivited jons? I just thought it seemed odd that in the "Riveted Jon" section they have very similar counterparts to the Sierra boats. The gauge of aluminum looks to be the same, but the weights were a little different if I remember correctly. Anybody know what's up with these? I was quoted $1825 from a dealer today for the MV1648NCS with factory full floor which is shown in the Sierra line. The person I spoke with wasn't the regular salesman so I hope we wasn't mistaking as I am seriously considering pulling the trigger on it.