I have an 09 1700 Classic as well. Mine came with Kawa leather bags as a promo and I bought a Quick disconnect windshield, so our bikes are pretty similar. The saddlebags are small. My Frog Togs just about fill up one side. I have a Cartech tail bag that I can bungee cord on and it sits on the seat behind me. Holds quite a bit of stuff good for more than a weekend. I don't have a tank bag since I couldn't find one that fit right with the tank gauges and display. I did buy a small magnetic fanny pack size bag that I put on the tank. I usually stick the keys, sun glasses, insurance papers, telephone etc in it and take it with me when I leave the bike of course. Its really handy. As for saddlebags if you need more storage than tail bag and a sissy bar bag (which can be very big) saddlebags will help. I also have heard that saddlebags may be better for bike balance or handling than a large sissy bar bag, but i don't have experience with sissy bar bags. Lots of folks use them so they can't be that bad. I like the looks of the Saddleman TS3200 tail bag, about $80 at Dennis Kirk. They have two models. What I like about the bag is they way it sits low on the seat. I haven't bought one yet, maybe for my trip next summer.
Good luck with your decision.