The Alaska Airlines Visa Signature is offering 40,000 Mileage Plan miles and a $100 statement credit after $2000 spend within 3 months. The card has a $75 annual fee.
The value proposition for Alaska miles of course is their myriad airline partnerships and reasonable award chart. Cathay Pacific (which Alaska admittedly has less access to award seats on than other Cathay partners do) is an especially great value as is Japan Airlines.