what turbos should I use?
 

I am wanting to run 15 PSI but dont want to do it on stock turbos...what turbos can I use besides stock that will bolt right up that can handle that PSI safely?

you could probably upgrade your twins to run 15psi. You could also run a single in your FD and easily run 15psi. Note that you will not be able to do this simply by "bolting up" a turbo. You will need a multitude of other modification to safely run this boost level. Check the single turbo forum. They can help you much more than I can.