All new suspension??

I was just curious to see if I was going to upgrade everything what i should all buy and what brands. I'm new to all this and have no idea where to start and was looking for help. My pick up use to ride like a cadillac before the 2" leveling kit and 20" tires. I know there has to be alot of options to get the ride back to nice. Also i only have put on the edge CS and was curious as what my 1/4 mile time should be. I was out messing around and ran 13.7 is that normal?