Good place to host a logo design contest?

Does anyone on this forum have any good experiences in hosting a logo design contest? If so, which site, or sites, are the best?

Also, does anyone have any advice on what to consider when trying to decide on the winning logo design?

https://www.designcontest.com/
http://99designs.com/about
http://www.logocontestreviews.com/

You can share the link of the submitted logo to a forum like this. Let all of us cast our vote and allow us to give some feedback to our chosen logo.

Here are a few:

• 99Designs
• Crowdspring
• DesignCrowd
• PinnacleLogo