if you can afford cusco, get it.

thickness depends on what you want. generally people go a thicker bar on the rear. cusco vs. whiteline, i think the cusco bars are strong (when comparing the diameter).

alk, just get a whiteline street one. they come in comfort, street and race. race is pretty intense for the street.

get a whiteline roll centre kit.

coilovers. teins are alright. hsd and what not. try the other mods before you drop cash on coilovers.