I believe that the Grand is basically a step up from the Sport. The Grand has a water filter system, where sport does not. Grand comes with stove cover, and sink covers, wall clock, heated underbelly.
Not sure if there are other things, but those are in the brochure that I have.
I just picked up the sv-295 with the outdoor kitchen and cant wait to use it.
Only another 4 months ( If this snow stops falling anytime).