The ASUS model that I've seen in a lot of reviews is the ASUS GTX660 TI-DC2T-2GD5. That's the DirectCU II TOP model which is factory overclocked to a Core Clock of 1058 MHz.
The GTX660 TI-DC2-2GD5, that you've linked to, is the reference clocked version.
The MSI N660 Ti PE 2GD5/OC in your link also has a $15 mail in rebate which makes it the better deal.
any idea when the TOP will be availible to buy from newegg and how much it'll cost?