General discussion is probably the best area.
Welcome to the forum! I'd be hard pressed to swap out from an XT660 personally, but if anything can replace it a WRR can!
Happy Trails makes the only factory hard bags and racks for the bike. Wolfman has very nice soft bags and racks for it.
Seat Concepts and Sargeant make better, more comfortable seats.
IMS makes the largest gas tank, 4.7 gal, and the smallest aftermarket, a 3.1 that doesn't require secondary pumps. The pumps themselves are simple, reliable vacuum powered pumps, but I still went with the simplicity of the 3.1.