Voting/digg Module

I'm looking for a module that allows voting. I need to have a page or whatever a module uses be promoted to the front page after either a certain amount of votes or after having the highest amount of votes of all pages and then a certain amount is promoted to the front page. As with digg, I'd like things to degrade and go after a certain period even if it has the most votes/diggs. I'd also like a karma system where a user gets karma/points for creating a post and karma/points for voting.

I tried the vote up/down module, but couldn't get it to work since there is very little installation documentation and contacting the module creator yielded no reply. The two problems I had with install was A) The linking system did not work, and B) The content was not promoted to the front page.