the adv is much cheaper than buying those items and installing on the non-adv. i have zero isses wih my adv windscreen so see no need to replace it. i bought the suzuki handguards at a deal from somebody for $50 but can't see that they are good for much other than looks and wind protection. if you don't plan or loading up the gear and riding, the bags are useless. a top case is much more usable for daily errands (beer) but the side cases hold a bunch, are watertight, and you can pack waterproof bags on top with the strap tiedowns already installed. i added a center stand, hwy bars from forum sponsors, bar risers (which were not needed), a fork brace, and a electrical socket. the most expensive thing i needed was a seat as the stock seat was uncomfortable for me after 20 minutes.
U.S. NAVY, RETIRED