hi im wondering what kind or car i should get that i can customize alot, safe, and under 10g. suggestions?

There are many cars that fit that criteria. Any number of small FWD cars both foreign and domestic have good performance for the dollar as well as aftermarket support for both performance and appearance mods.

domestic: Dodge Neon, Ford Focus/ESCORT, Chevy Cobalt/Cavalier, Pontiac G6/Sunfire, etc...

foreign: Honda Civic, Toyota Celica, Mitsu Lancer, Subaru Impreza, etc...