Alot of the skins suggested I've seen on other servers, generally they just seem out of place. As for the hd model of the classic, I think we should keep the old one. Don't like it with the headcrab on.
If we were going to replace the predator skin, the mummy one wasn't too bad.
Here are some good skins from another server I play on occasionally.
http://www.sarcasmpoisoning.com/zombie/downloads.php
If it's not too much trouble, a plug-in that allows players to choose their own model (human model) is usually pretty cool. I used to play on a server that had some cool ones, desert camo ct, umbrella corp sas, and a few others.
The spazu ct skins are nice too because the gray fits better for zombiemod than the classic cs uniforms (scroll to the bottom of the page) http://www.sarcasmpoisoning.com/zombie/profiles.php
"An Air Force A-10 Thunderbolt II flew a show of force and expended flares for emphasis over Salerno after enemy forces attacked a coalition forward base. The arrival of the aircraft prompted an immediate retreat by enemy personnel."