One thought that is always considered in the miles+points game is to diversify your portfolio. Arguments can be made to focus on one or another airline to get elite status but for the average user this is probably not going to happen quickly. So, having cards like the Chase Sapphire Preferred that have myriad of transfer partners is a very good idea.
Every August, one of these cards, the Starwood Preferred Guest Credit Card and Starwood Preferred Guest Business Credit Card increase their Starpoints bonuses, which have numerous transfer partners to choose from. In fact, they recently added Korean Air to the list.
Each card is available for a $95 annual fee (waived in the first year) with bonuses of 30,000 points for each card after reaching the purchase threshold. You can also get referral credit of up to 55,000 points if someone you refer gets the card also.
The bonuses will stop soon so if you do not have either of these cards, now is the time.