Installed bootcamp and ran 3DMark 2011 for a couple of hours in Win7. No problems whatsoever. The Intel HD 4000 isn't active in Windows so I'm also starting to suspect that the integrated graphics chip (or the drivers) is the culprit.
Here is the list of software that I have running pretty much constantly in OSX. Haven't yet tried turning them off but will do it tonight:
Alfred
DropBox
1Password
Fantastical
BetterSnapTool
Neu
nexTab
TotalSpaces
Evernote
OmniFocus
TypeIt4Me
I have a BTO 2.6/16/512, almost the same configuration as Jimmypop's (BTO 2.7/16/512). Another similarity is that the screen tearing is also strongly (exclusively?) associated with the computer waking from sleep. I'm also pretty sure that have exactly the same problem.
Please let me know, Jimmypop, if you take your laptop to an service provider and hear what's causing the tearing. My repair shop is understaffed due summer holidays and I can't afford to lose the computer now for extended period of time due to occupational reasons.
I have the exact same BTO system than you, and a few of the same pieces of software. So I'm pretty sure we have an identical problem. And judging by the comment prior to me, it may probably be software related. So the software that we both use (according to yours and my list) is here:
Alfred
DropBox
1Password
Evernote
So it could be one of these that are the offenders. However I thoroughly doubt it is Alfred... and maybe Dropbox. They are both constantly open and I would assume the issue would crop up more because of this.