First off, welcome here i see its your first post, second, there are a ton of people asking that same question, do some searches.
but yes i think the TC3 even in stock form without an aftermarket chassis can compete with all the newer more exspensive cars, and parts are still everywhere and will be for yrs, and if not, you can put most tc4 parts on your tc3. i should know, i have a tc3.5 tc4 chassis braces, shock towers and diff cases on my tc3