[yeloZX3]

in my opinion, I would suggest you do the cams and cam gear at the same time if you are going to get cams.

also, without tuning cam gears are quite useless but tuning will depend on what modifications you have done to the car, tuning will probaboly be the last part of the modification because tunning cost you some $$$ on the dyno unless you don't mind paying the tunning cost again in the very near future.

so I suggest TB first.