As long as it is proper steel (I dont know too much about steel but good quality spring steel is a must), size depends very much on country/continent, be sure to hold that into account.
You do not need to go overkill on the amount of picks.
Rake and half-diamond are used 90% of the time, be sure to get some different tension wrenches , very useful to have at least a couple it sucks when the single one you have does not fit
.
Though after a while I started making those myself.
Cannot recall the brand, "dino" I believe is the name of the stuff I used to have.