Consideration of college progression

I tried searching for the answer first but couldnt come up with anything conclusive. So here it is: Do Top MBA programs look solely at the final GPA of a candidate, or do they look for progression? Possibly some schools focus on the applicants last two years of undergraduate course work?

The reason I ask is because, as I have discussed before, my first 4 semesters in undergrad were in a completely unrelated field of study. I got out at the end of my sophomore year with a cumulative gpa of about 2.7.

Fast forward to today... I will be graduating from a Big Ten school with a degree in finance. Since the switch I have brought my gpa up to a 3.2, with my last two years in business school averaging around a 3.5-3.6. Major GPA will be about a 3.75. I have great EC's (Leadership positions in several business related associations, and club sports). I had an internship at a small regional bank, where I was mainly working in PWM. Have yet to take the GMAT, but feel pretty confident that I will do well.

Will it be an uphill battle for someone in my situation to break into a Top 15 MBA program given my current credentials. I understand a lot has to do with my post undergraduate career and my GMAT, but Im just wondering if my first two years will come back to haunt me, especially since my GPA is still only a 3.2. Thanks for your opinions.