Investment banking questions

[chisness]

Assumptions:
-College ranking: about 5-20 (exclude very top schools)
-GPA: about 3.5
-Major: Econ/finance/accounting
-Achievements: No major awards or projects completed
-Interviews: Above average, well prepared for

How likely is it to get an i-banking job at:
1) Top firm
2) Any firm

The assumptions are pretty close to describing me and probably a lot of other students vying for the spots. What are some major "hooks" to getting these jobs aside from junior year summer internships? I know it's heavily GPA based, so once a threshold GPA is met, does the interview become the main factor?