I believe the kits are somewhere around $350??? Plus you have to get a new rear driveshaft made.
I think the "super short" kit allows for a 9" longer driveshaft. So assuming the stock shaft was around 32" you would have somewhere around 4 degrees less angle on the shaft depending on total lift height, that number increases as the lift height increases (shorter shaft increases angle quicker than the longer one as the lift height increases).