As someone coming from the other side, if your racing org allows it, just get a cup bike and be done with it. It's about the same amount of money, but you'll put like 40h into a regular one before it's where the cup bike already is. The only reason I didn't go that route is the cup bikes are restricted in our racing org because of the front forks.
I got a really good deal on my cup bike, so i couldn't pass it up.
i think buying the street version is a better deal, you can the choose what suspension upgrades to make, the wp suspension still has to be valved and it needs different springs as well.
you will end up spending about the same but you will have the suspension you need, unless you are about 120LBS and even then i think the cup suspension still too soft and wp's valving is just to progressive for my taste.
on the power limitation, its just a a plate on the throttle body remove it and presto there is the rest of your horsepower.
as far as updates i haven't seen anything, there is a few tips here and there that i have gotten from one of the kids dad, but nothing major