Just to point out that the i920 is now discontinued. So the 930 is the better choice a few dollars more. $1 more at Newegg.ca. It won't be long before the 930 get's discontinued. Yes some places still sell the 920's but that due to how much stock they have. There were some real cheep deals in some of the States stores but sold out quick and  don't have them anymore.

The AMD 6 core has been proving to match the i950/960's in multithreading software. But the i930 matches it in single threading as in gaming. The big problem with AMD are motherboards. You can't get a really good MOBO that is SLI. There are a couple but they are not up to par as what you can get for the Intels. So if your thinking or needing nVidia as in cuda and Open CL you are SOL for good boards.

If you can wait till next year it may be to your advantage with the new Intels.