http://videos.howstuffworks.com/military-channel/7050-top-ten-tanks-the-m1-abrams-video.htm
Crap, crap commentary, but some interesting insights into tanks on there. I found it whilst I was looking for info on the Merkava (the vid on there shows the older versions)
It mentions at one point (in it's own vid) the Challenger II getting hit by '14' RPG's and a Milan missile, and sustaining only sensor damage. I think it's important to note that the RPG type, and warhead, are more important than the number of impacts.
The new Merkava looks mean too, with modular armour for the top of the turret. A very interesting tank, designed with crew survivability (to fight another day) and an escape hatch in mind.
Like Kenan says though, doubt any tank would fight after a Vikhir to the flank, top or rear.