Digg like system

Hello,
I’m planning to create a digg-like website but for images only. Here’s how I see it:
1. User uploads image
2. Post with this image lands in “Upcoming”, or “Waiting Room” posts category
3. People vote it, positive or negative.
4. If it’s about, let’s say 50 votes and 80% are positive than it lands on main page.

Here’s my question, how should I make it? Are there some special plugins? Thanks.