Navi,
First of all ... WELCOME to the Forums!
Here are two suggestions...
The first one, the Gerber Gator Saw I is really good ... I bought one for my Son.
The second one is a little smaller.
Hope this helps. I think either of these would be better than the wire saw.
Although I know a lot of people keep the wire saw in their survival kits... it
would be better than nothing.
http://www.discountcutlery.net/en-us/dept_24706.html

http://www.rei.com/product/730550

Tony