Plasma rifle is the best i found..
Sorry to say,but you haven't even scratched the surface yet.There's Eugene(good minigun),Experimental MIRV(WMD ),Alien Blaster(super cool laser pistol) Xuanlong Assault Rifle(Modified Chinese assault rifle) etc.There are also some special weapons but you'll have to find them yourself.
[Edited by Spamwise_GameG, 12/27/2008 1:26:11 PM]
How do you get the Alien Blaster?
In my picture blog. xD