best supercharger for 302 windsor

[Z24O]

i am thinking of supercharging the 302 in my 240z....the motor has alloy heads,edelbrock performer with injectors,the block is o ringed,forged pistons 8.5:1 comp ratio,roller cam,roller rockers,wolf 3d engine management system........it was previously set up with a big single turbo(previous owner),i have a z with an rb30 turbo and although it is fast when you race it,it lacks the torque for normal street driving as the turbo doesn't really spool up before you change gear(no high ratio diffs for z's!!!)

so i am reluctant to go the turbo route with the 302

my question is,out of the remote mount(ie not intake manifold mounted)units available,which do you guys recommend and why,i figure 9psi would be ideal but i could probably live with 6 psi.....i want around 500hp

i have been looking on ebay and have seen powerdyne,paxton and vortec units at reasonable prices

any thoughts,comments,advise or recommendations on my topic generally most welcome

thanks

paul

western australia