If your not used to working with turbos and the dsm world dont start modding one you plan to DD.
You can find a ta for about 5-8 easy wont be immaculate but parts are very easy to source.
Do not get a GTO unless you just like driving in a straight line, they weigh a lot more and dont turn worth crap until you do extensive suspension mods to, which also will cost more then for an fbody.