I drove for a year with FI HFCs, catback, and gen 3 long tune intakes without a tune. You don't *need* a tune, even if you drive aggressively. You just won't be getting the best performance out of your setup without one.
Swapping out stock cats for anything else would be a reason to get a tune, but if you've got more modifications planned, I would hold off until they're all in place and you're happy with them.
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Fast Intentions 18 inch resonated catback, Fast Intentions resonated HFCs, Stillen Gen 3 CAI, EcuTEK tune, 311whp
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