I'm actually happy with the stock suspension. I don't know motor bikes well enough to judge what's good or bad, but it seems to be okay.. This is my 3rd bike in four or five years. First was a 96 nighthawk 750. Front forks dove bad when braking but I got used to it lol. And the '13 cb500x which I just sold was great. That thing was fun, and just damn flickable!! Would have kept it but it seemed maxed out at highway speeds. I know it technically wasn't, but it made me uncomfortable. The revs were too high for my liking at 65-70. Not so with the 919. I love it so far and haven't really RODE it yet. I haven't messed with the damping and my preload is set kinda in the middle somewhere. I'd have it jacked but I'm 5' 10" with short legs, so I like how it sags when I get on so I'm able to get most of my feet on the pavement.
It's different strokes for different folks, but I could live with a 500.00 experiment. Maybe. Anymore would be pushing it. This bike is nice enough as it is. If I had a grand to throw at it, I'd probably buy all the necessary new components to change it over to that sexy green color I love so much.