If all he wants is 2" and his current coils are still in good condition, I would just go with a budget boost. Their all pretty much the same, except for the shocks. From what I am told, guys like Skyjacker Hydros over Nitros for a good ride. OME shocks are also well liked.
Here is a 2.25" BB, as most other 2" BB's are actually 1.5" when done.
http://www.4wheelcustoms.com/Products.asp?Cat=1208
A BB will allow for him to run up to 32" tires. This is what I am going to do to my TJ one of these days. You can also go to a coil lift, but they do cost more as you start to replace more parts as you go up. There are also body lifts, as some guys also add a 1" body lift.
TJ's have tons of options! He should pick up a Quadratec catalog.
www.quadratec.com
