there is a lot more needed when upgrading a turbo than you may think. i will try and shed some light on the topic seeing how i am currently in the process..
first, you need a new turbo manifold (as you had listed)
then you will need a turbo that fits on to that. most aftermarket turbos will.
the exhaust housing will be different, so you will need a new downpipe, or at least an elbow welded on to your exhaust.
now, youre going to be getting MUCH more air, which means you will need more fuel..
look into a walbro fuel pump, some 550cc injectors, and maybe a fuel pressure regulator.
you will have to "trick" the car into thinking its not getting that much air, so you will need a LEX AFM or FCD.
this is all assuming that you have the basic upgrades covered. if not you have some things to take care of before you need to worry about a new turbo.
the list goes on and on and on........
here is a guide on how to start upgrading
^ check out the FAQ section in general for some easy answers.
it looks like youre located in ohio, as am i. if you have any questios, just ask