Hi !
I have a 2006 H3, and here's what I've done, in order.
1. Alpine Head unit w/backup camera, and 2 Alpine door speakers.
2. 3 inch lift/level kit, purchased off ebay, it utilized Proform shocks.
3. 4 wheel alignment, (Done after lift/level kit installed).
4. Magnaflow muffler, (4th Gen. Camaro, cost me $104.00, plus the tips and muffler shop installation, came to a total of $260.00).
5. K & N air filter in the stock air filter housing ($50.00).
No CEI lights, much better sound, and seems to have a little more low end grunt.
6. Full length Gobi roof rack w/tailgate ladder, and a brush/bumper guard. (purchased used from a member of this forum !).

Hope this gives you some idea of options for upgrades,

Steve.