Originally Posted by mikeSS
i think caught cans are over rated. i bet most people here wont even have there car long enough to see damage from excess oil lol.
I know for sure that is not true of forced induction cars. I realize the OP is not talking about that, but I think it's important to point that out. A catch can is relatively inexpensive and is especially important for FI cars.
To the OP: I don't see headers and drop springs/sway bars on your list. I highly recommend those. (Along with a dyno tune!)