My personal favourity is aaaaaaaaaaaaaaaah! and team fortress2 is quite good to.

http://www.zshare.net/audio/8621035d8ce443/

http://www.zshare.net/audio/8621067b4d9c33/

 

I don't know what a loadest is, but here's two.

I made a Konane scream chop, everybody hates the konane scream chop

http://myraid.ws/rage/index.php?dir=wav%2Fmyraid%2F&download=highpitch2.wav