How to drop the front end? How much?

[PRattenbury]

So, I have the engine out of the truck, the front clip is off, the front suspension and steering is out, all I have left is a couple frame rails sticking out from under the cab. Pretty distressing. So I was looking at my spindles and my springs, and decided I could use some new springs. My spindles look okay, other than being covered in sludge. I have new control arm bushings and ball joints to put in. I am running some 275/60R15s on the front. I don't feel compelled to run out and buy any 22s, so I guess I'll stay with what I have there. I don't feel the need to lay rocker, either. So I guess what I am hoping to get from the wealth of knowledge on the subject here is, what parts should I get to drop the truck enough so you can certainly tell it's lowered, but not so low I'm rubbing things and panicking at the sight of a speed bump? Can someone shed a little light on this for me? Any suggestions as to what vendor to use that would have what I need in stock and be able to get it to me quickly? Time is not my friend, even if the truck is not my DD. Thanks for any wisdom you might be good enough to share!

Paul