If your going to go high $$ for the Atlas you should also take a look at the Lovell. Very stout (comp tested) and air actuated. Can be shifted under load or at full open throttle!
As for coilovers you may also look into the new ORI struts. Much more user friendly (no figuring out spring rates) and better raod manners. There are several posts on Pirate about them.
As far as wheel base. I plan (when ever my time comes) to stretch the front out around 5 inches. Better tire clearance to keep it lower.
What size tires are you planning on running?