Wordpress Site - Have users registers and log in before posting comments

I have a photo review blog. I post a picture and users comment on the photo.

I would like to have users register and log in in order to post any comments because I am not a fan of the default "comment" form on WP. Then when a comment is posted it would display the name of the user, # of comments, etc. Much like a forum.

The ability for people to "like" a comment, then displaying the total number of "likes" each user has received as well would be awesome.

Are there plug-ins that would handle this, or is this something that would have to be custom coded.

Check out Disquss

Installed it and am checking it out as we speak. Looks like it will do it trick.

I has hoping for something more internal, but beggars cant be choosers. Appreciate it.