Nightmare isn't active much lately,Probably he have some other reasons in life that's making him more busy.
Oh well here's my list.
Mrama ( Makes some realy simple textures with a nice quality stand out )
avwave ( Very good at making 3D art and all )
macperfect ( Nice and smooth walpapers )
Rutzor ( Old days making some intresting videos for toribash )
DarkJak ( Makes some nice shading robot heads and all *Glares at Darky with certain expensive heads* )
These are the peoples that are the top 5 in my mind if I rethink again.
Other then that this thread doesn't say "Who's the top 5 Texture Artist " so guys think before you post...