Race or comfort seat is a MUST! I have taken some long trips when I had my 848 and I didn't think it was possible to make a harder seat, but it looks like Ducati did the impossible... they made a harder one. Could not ride for more than an hour on it and be comfortable, soon as I switched over to the comfort seat it was a HUGE difference! Are you looking for performance upgrades as well?
Also, talk to your dealer and make sure yours has the new fuel upmap. All models and exhaust versions for Termignoni have them as well. INCLUDING STANDARD EXHAUST FROM FACTORY! Anyways, yours SHOULD have the upmap already in it, but have them check it before you leave the dealer, it only takes a couple minutes to upload it into the bike. That'll make a big difference in the power output and low rev cruising. Won't hurt your peak HP either.
If you are going for biggest bang for buck with an exhaust, Austin Racing Company makes a few different types of exhaust systems for the Panigale that are second to none over Akra and Termi. If you do go with the Termi we have seen that the slip ons have proven to be much more effective this year than the full system. Read the thread "Austin Racing Exhaust Taster Possibilities" Everything you want to know about comparison is in that thread.
Otherwise, congratulations on your new bike and enjoy the ride!