Yeah, the Instinct retails at $399. That's the cheapest I've found it anywhere.
I'd shoot both of them and see which one you like best. I'd say you will never see the difference in the speed because more than likely you'll be shooting heavier arrows than IBO speeds would dictate anyways. And what's less than 10 fps when you're already shooting 280-290? Nothing.
Good luck with your decision. Take a close look at that Instinct. I like it a lot. It has become all the rage at our local shop.