640 (75%), V33 (66%), Q44 (68%)
AWA: 5.5 (77%)

Undergraduate: top 10 public schools in the US
GPA: 3.7
Major: Humanity

Can I please get some expert advice?

I took the GMAT for the first time early 2011, and don't plan on taking it again.

I am not the greatest standardized test taker (my highest SAT score was 1150 (out of 1600) and I took it twice), and I studied for the GMAT for 6 months while working at a start-up as a finance and marketing manager (~50hrs/week).

I am starting a non-profit organization, and don't have time to study for the GMAT again. I am pretty confident my score won't improve much, probably 30pts much, if any. I took over 8 practiced full length test, and my highest score was 670. I am planning to apply 2012. Will the admission officers frown upon me if they see me taking the GMAT early 2011, and did not attempt to try to raise my score since I "extra" time on hand?

I figured I can improve my resume and get more involved in the community with the Organization I started, which I personally think are better benefits than improving another 30pts on my GMAT. (correct me if I am wrong)

I have about 4 years of solid work experience, about 2 years of Full time work experience. I would like to get into organizational behavior/HR consulting.

I really want to go to the top business schools (Berkeley, Chicago, Stanford, UCLA, etc), but I am worried that 640 is not a good enough score for my target schools. Please advise.