It should be noted that generally I am a huge ASUS fanboy (both my and my fiancee's 5970s are ASUS). My only problem with their most recent reference cards (both ATI and Nvidia) is that they haven't been sufficient to get a very good overclock at a good temperature, whereas cards like the Zotac have a very nice non-reference cooler allowing it to go well beyond it's reference potential. You'd be hard pressed to find an aftermarket cooler (that is currently out) other than water blocks that will outperform that Zotac cooler on an overclock.
Here is a video that shows just how much cooler you can get with an AMP! vs stock: http://www.linustechtips.com/ltt-vid...inus-tech-tips
Keep in mind he is testing open case and the Zotac AMP blows into the case, but with your Antec 900 and it's superb ventilation that shouln't pose as big of a problem for you as some.
As far as brands, ASUS is a rock solid brand with a great warranty and a good RMA (I know from experience, RMAing 5970s is pretty much standard issue). One nice thing about the ASUS is that the warranty goes from person to person based on the PIN number on the card (this, however dosen't affect you too much since you plan on keeping the card for a long time, and it would affect the person after you, but expires in 2 years anyway).
Zotac is less of a big name as ASUS but they are known more for taking reference designs and tweaking them for performance (similar to EVGA but less of a big name). The Zotac card does carry a lifetime warranty but to my knowledge only stays with the original owner.
All in all, you should be happy with either card, it is just a matter of which situation you think fits your situation better. If you do decide to go with one card in the long run, the Zotac with it's far superior cooler will ultimately allow you to push a much safer overclock as far as temperatures go.
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