In 2012 Starcraft went back to making some of their own floorplans, that's why it seems a little different, they stopped making "clones" of Jayco. Our 2013 also does not have a ducted furnace, I don't really feel this is a big deal. We found using a 1500W electric, tower type space heater works much better. It's quieter and maintains a more even heat. We still have the furnace on, but it only kicked in if the space heater couldn't keep up. This was in our 17Z, we plan to do the same thing with our Starcraft, though we may need to get another heater.
DSI is nice, but not necessary, our 17Z did not have a DSI water heater.
As to price, push them a little, this is the time of year most dealers want to get things cleared out.
As to towing, you really should ask about that in the towing forum, it is not as simple as you might think. My honest answer, you "might" be ok, please check into this more before proceeding.
2013 Starcraft Travel Star 229TB
2011 Jayco X17Z(traded in)
2010 Jayco Jay Series 1207(traded for the 17Z)
2011 Chevrolet Silverado 2500HD Z71 CC 6.0L/3.73
Reese "Pro Series" 800lb Trunnion WDH w/sway control