i wouldn't get a copper shim. their main purpose is to protect the fragile socket a chips, however if you're careful than most people don't have to worry about it.
the other arugment is that they help your cooling. that's unjustified, if anything it INCREASES your temperatures, by transferring heat back to the idle PCB board and thus sending heat back to the core of the cpu.
i wouldn't use one, and i don't think you'd need to worry about it too much either especially since you're using a 700e which won't crack as easily as a tbird
