This looks like a good cheap option for a backplate too:

http://www.newegg.com/Product/Produc...82E16835999351

It's pretty much the same as the thermalright bolt-through kit that was mentioned earlier, except a little cheaper (basically because you aren't paying for the screws & top retention system, which you wouldn't use anyways.)

This mod for the Infinity is really impressive I always wondered why the Infinity didn't do better in review/comparisons. I'm very close to deciding to get an Infinity and do this mount mod, as well as use two quiet fans (like yate loons.) I had previously thought about using an Ultra-120, as I love Thermalright stuff, but it looks like this setup would probably edge the Ultra-120 out a bit.

The only other thing I've been considering is a fairly inexpensive water cooling setup (probably no more than $150-$200,) but I"m not sure if the added cost would provide enough benefit over this modded air setup (other than bragging rights, I suppose.) I'm planning on upgrading to an e6600 in a few months, with a minimum overclock goal of 3.6ghz.

Edit: One other thing, what is a good way to mount a second fan on the Infinity, as they only give you clips for one fan? Tape/zipties would work I know, but I'm looking for a more elegant/professional method if possible.