I think most people would agree on the three main things one would buy for their Spyders
1> Safety equipment, such as lighting
2> Things to make the ryde more comfortable, such as floor boards
3> bling ( fun stuff) lights LIGHTS AND MORE LIGHTS. hehe
For me the very thing first I ordered to have installed were HID headlights, then CB/intercom, then the start of my love of bright lights
So ryde your new bike untill you figure out what types of things you want to get done, then start looking around. the biggest issue you find then is everything for Sypders seems to be more expensive than just about any other kind on motorcycle.
So do your homework and ask lots of questions