I kinda did my N/A mods in order of what I felt I could tackle, weekend mechanic, and what I could afford at the time. With that being said, everything mentioned from the others above is true. TB/Plenum was my second mod after K&N cold air kit and I didn't feel much from either, again from what was said above. BUT, if you plan on doing full exhaust and the other N/A mods when your ready/can afford them, then get that TB/Plenum on there and keep saving. It all adds up. It's a pretty easy swap. I'm sure there are write ups on here and advise about high idle after the swap.
Good luck mang and let us know how it goes.