Better comments system?

I’m noticing a lot of the blogs I read are using more sophisticated comments systems than the default WordPress one I am using.

Is there a standard emerging? Or close to a standard that I should be considering to use here instead of the default? Or if no standard what are your favorites and why? I’ve taken a look at some of the plugins available and they see interesting but I’d rather only change my comment system once.

Any suggestions?

Former lead designer at BioWare (Dragon Age: Origins, Neverwinter Nights). Creator of Raiders of the Serpent Sea.