So I found out that the reason why my car was leaning to one side was that the front driver's side springs are sagging, and the front passenger side springs are no longer as taught as the rear two. I figure since I'm going to replace both, I might as well replace all four springs and shocks to lower the car about 2" (I hate that huge space around the fender well). I have two questions:

1) I get all my service done at Acura, but is this something they can/will do since it most likely involves aftermarket non-Honda parts? So where do I get it done? How much for service roughly?

2) What is a popular setup? What manufacturer, model etc for the parts?