Well ya can't actually buy a 7850 .... AFAIK, they won't be available for another month about which time I expect we'll see the 650 / 660. I never buy cards between January and June because I don't like the risk w/ 1st gen hardware, last year's is being faded out,the new non-refernce designs haven't been released as yet and the driver bugaboos are still running rampant.
Unless I misinterpreted the THG article, there will not be a single "reference" 7850 released. That tells me that every vendor has an issue or 2 with the base reference design and their fortunes will be better served with beefed up models.
So yes, if ya get 560 Ti's now, you might have some buyer's remorse a few months down the road, but I don't see ya escaping that with a "1st on the shelves" version of the 7850 or 650/660. If ya gonna wait, I'd wait till Memorial Day weekend (May 31)