Yea so to get a pretty ridiculous setup, and have coil overs in both the front and back 2.5 fox shocks:
Front shocks - $1600
Rear shocks - $1100
UCA - $350
Spacer - $150?
Total: $3200
You might be able to actually find the rear shocks (haven't tried personally) that are fox 2.0 like is in the mopar kit for quiet a bit cheaper than the rear 2.5 shocks.
Still about $1000 cheaper than the BDS coilover kit, but for this much money its not that different ultimately. Personally, I am not a fan of 6 inch kits and the setup above would ride phenomenal and still allow you to run a 35 just like you would with a 6 inch kit most likely. Install cost should also be quiet a bit less vs BDS.
For me, I think the 3.5 inch height gain (2 inch rear) with 35's is the absolute best look for our trucks