Unless you'd like to shell out 10k for a shop to do a solid front axle conversion and the supporting mods, buy a $1700 super lift. Remove your 2.5" suspension 'lift' and put on the super lift. You'll be 1.5" higher than now.
Anything else is really a shot in the dark on pricing. Every shop is different in their rates, what parts they use, how they do things. Cheap ain't good, good ain't cheap. Shop A can charge less than Shop B, but Shop A's work might be a hacked together death trap.