What is the best way to reduce/consolidate my student loans?

I'm about to graduate from medical school. I have several Stafford/Perkins Loans totaling $28,000 -- all from undergraduate and graduate education. I also have two private loan totaling $75,000. What is the best way to consolidate my Stafford/Perkins Loans into one payment? Also, is there anyway that I can lock my private loan into a lower interest rate through consolidation? If so, what lender offers best rates -- as my $75,000 private loan is currently locked at 10%.