I have an auto as well. What I recommend:
1. gears (nothing less than 4.10 for the auto)
2. subframes
3. full exhaust (I run a full MAC exhaust and it felt like I picked up 30+rwhp)
4. tune (tune also includes a complete re-mapping of the auto line pressure and shift points)
5. drag radials (with the gears and tranny tune alone, anything less will just spin like crazy)