coilover

I'm buying the camburg 6.0 kit in a few days and I'm ditching the torsion bars for 2.0 coilovers. I don't know jack about them other than I'd need an 8" shock and the spring length should double the travel so I need 16" springs but my questions are about spring rates, I know I should post this...

I have a 2003 4wd Edge that I'm looking to make upgrades to....specifically removing those torsion bars. I've looked around here and a little on dezert rangers, and i've found two ideas that interest me, but i can't figure out the difficulty level or $$ for each of them. i also wanna make sure...