Delete function for comments.

Hi, my website is [login to view URL], I need an improved comment system, or a new system, please don't use the current system, create a new comment system for me, the comment system has to have the Bury feature, which means that whenever x number of people voted negative for the comment, it'll be deleted. Commenter should also be able to edit his/her comment within y secs. The value of x and y should be able to be set from the admin panel. As admin, I'd also like to have the ability to delete comments. I need this ASAP. Please let me know.