Uther39 :
Personally im waiting for company's to bring out the 680 with there own cooling solutions, like ASUS with there Direct CUII.
To each their own, on that one. The GTX580 had a pretty decent stock cooler and the GTX680 does as well. The custom cards from ASUS and others will come later, maybe even 6 months out. The DCUII boards were not stock and had more voltage regulators and such to allow more overclocking headroom and are more stable at higher power draw. The stock 680 allows for a good bit of OC, but I'm not willing to wait for the custom cards to show up that will cost a premium later down the road. This is up to whoever is shopping I guess.
pacioli :
EVGA is always near the top on overclockability
EVGA has the best customer service of any gpu maker I know...
EVGA has a lifetime warranty...
Also EVGA just released their non reference version of the 680. Meaning it has a higher OC potential with better cooling.
1) All stock cards with the OEM cooler are going to have the same OC potential, and will all have the luck of the draw on which chips OC well. You will have to wait for the custom cards to come out for a better say on who has the higher OC ability.
2) Warranty is good. But I unload my cards each generation so anything over 2 years doesn't matter to me. If you hang onto a card for a long time this might apply.
3) You mean non reference cooler, the card is still stock. A cooler card will yield a slightly better OC if you are trying to top it out. Again, personal choice. I'm sure you will pay extra for that. As I mentioned the stock cooler is pretty darn efficient.
I have had many ASUS cards and have dealt with their support and it is great as well. Just to throw in a personal experience on that. I've never heard anything bad about MSI support either. As the GTX680 is pretty scarce right now. I'd get what I can get.