Contact Sync b/w Verizon, GMail, and Hotmail

Greetings!

I have an iPhone 4s and I am trying to find the best way to sync my contacts. I keep getting multiples of the same contact and I don't know what the best way to go about resetting my contacts is...

I have a GMail account and Hotmail Live account synced with my phone in addition to adding contacts to my phone that aren't on either my GMail or Hotmail account. I also have Verizon so they do automatic backups every so often...

Any advice on how to get my contacts under control? Thanks in advance for the help.