In my opinion, if you have a degree, a CFA designation and a desire for a career in finance and banking, you don't need an MBA.
Back to your question. Top tier school with 3.0 GPA, your odds are slim my friend. I'm not going to say never because "you just never know". But I'd say you would need 760 on the GMAT. Top tier MBA programs admit applicants with an average gpa of around 3.6 and with a GMAT of 715. Check out Wharton stats.