maximum boost on stock turbo no more the 13psi i pretty sure 14 psi is pushing ya luck
asking what turbo is good to replace stock one is like asking a chick what they want for christmas, everything! depends what your after in power terms
as for what is included in a turbo kit, again depends what sort of kit you get, genrally you can get kits consisting of manifold, turbo wastegate if needed and all the other bits and pieces needed for a full no fuss bolt on kit
where can you get one? any of the performance shops in perth: Per4manz turbochargers, Xspeed, Evo R, Works Auto etc........
adrian