GMAT Strategy

Hello Guys I graduated from 4-years State university 3 years ago
I am thinking to apply for Mba.
and here are schools that I am considering-
1.Purdue
2.University of Illinois at urbanna-champaign
3.George Washington University

GMAT: 720
GPA : 3.1
Work expereience : 2 and half years

I know that I can not really go to top 20 business school with my GPA

1)Is my GPA still problem for me to get into those schools too?
Does my GMAT score possibly offset my GPA?

2)Is there any other school you would recommend other than those (If my GPA blocks me from gettting into those schools)

I got so streesed out with this grad school issue.Please help me

I will be waiting for your answer