Jkan 2001-- If i get a LS, should I get a Vtec head to go on it? Or should I just run a LS motor with t4 turbo?

What kinda interals mods should i need to do to be able to run ~10 psi daily? I'd like a min of 250hp with turbo? I already accounted for fuel system upgrade(pump,regualtor,and rail) etc....... Just what kind of mods should be done to the LS to safely handle 10-15 psi?

Thanks!
Spike

BTW, What would be a good price for a LS? Any years I should stay away from? Any thing I should esp. look for in buying a used LS?