I just would like it to handle good, it already rides a little rough so I'm use to that.

 

You could add a Belltech sway bar in the front. That will stiffen the handling up a bit

 

I have made my mind up, I want to do a 4/6 drop with 22x9.5s, 275/45/22 tires.
Now my question is, what would be the best riding kit I could buy?

 

It will look clean with a 4/6 and 22s. Good choice.

I would recommend this kit

07-13 Chevrolet Silverado/Sierra (All Cabs) 0" to -4" F/5" or 6" R drop W/ Street Performance Shocks

It comes with everything you need including the camber bushes and the transmission spacer. Other kits on the market do not come with these items. The struts and shocks also have a 2 year warranty.

 

Here mine 4/7 with same size tires. Just add a little space between the tire n fender.