It depends on how much you want to spend

.
Mass produced stuff:
Meguiars for certain things
Autoglym for others
Nu-Finish for polish
Mothers for certain products like cheap clay bar and naturally black etc.
If you are looking to go all out:
SwissVax
Nanolex additives for protection and glossy shine
Clay Magic for clay bars
P21 kits
Or you could save yourself the trouble and get my paint protection

jkjk....
The choice is yours.
My 2c.
-EXALTD-