So far I'm bone stock, I could go a little over the $600 if I had to. I also have a $75 gift card to the local Yamaha shop where I got my machine, so I'll most likely spend it all at Yamaha, so I'm close to $700. I'm thinking either a full GYT-R exhaust system, or a slip-on, skid plate and filter kit. Hmmmm..... What to do???