Thank you both! I actually didn't realize UR points don't transfer to US Air.

I also realized that, as a US Airways Card holder, one gets 5k miles off a ticket.

So new plan:

2 US Airways cards
30K SPG points transferred to US Air (will have them apply for one SPG card)
Total: 2x55k

2xSapphire Preferred with 60k transferred to UA for a 60k ticket.

The reason for applying for US Air over UA cards is that UA is issues by Chase and it's hard to get two cards from Chase within a 3 month period. The US Air card can be obtained from Barclays without affecting the other applications.