Picked up a removable gun holder from Seizmik - buckles in between 2 front seats, worked out fine of us.
Keep us posted on adding insulation to seat area, be interested in how that works out for you.
Jim, if money isn't an issue, I'd splurge for the 4. Same machine but gives you more options. You can always keep the seats folded down and not used them if you don't need them. Plus you can use the footwells under the rear seats for additional storage if you need to.
Sounds like you are well on your way! If you are not on the Hondasxs forum I highly recommend it. Tons of great resources and helpful guys. I'm running the PBR and they do help alot, though I had to add some metal washers because the rubber grommets tried to pull through. I also added a Rops storage bag to help hold smaller stuff. The stark bulbs are next on my list. Did you get the 72W? I was looking at the 90W but I'm concerned they'll be too big. I love the machine. Only thing I've been happy with is the tailgate is not really that tough. It could use more power, but then I could have bought a 1000. It's super torquey and has done everything that I've asked so far.
A buddy of mine talked me into taking it to Hills and Hollers in Lumpkin. I stayed out of the mud, but this thing climbed every steep hill like a billy goat.
Love my paddle shift. You will enjoy it.