I`ve been a long time lurker planning for my first mini AOR. I`m probably going for just 2-3 cards due to my avg. account age and oldest account age.

This is my current status:
Experian score - 749
Creditkarma - 759
Hard pulls - 4 in last 2 yrs. last one was 92 days ago
Credit Cards:
CSP - 9200$
Chase freedom - 8500$
BofA travel rewards - 3000$
Citi AA visa - 10k$
Citi AA amex - 10k$
Average account age - 10 months
Oldest account age - 2yrs 6 months
Current utilization rate - 7%


I`m thinking about applying for a few of the following cards in my first round:
1. Amex Delta - 45k offer
2. Chase southwest premier- 50k offer
3. US Airways Premier - 50k offer
4. Amex SPG

My goal is to diversify my portfolio and open lines of credit with different banks/issuers. AMEX being the priority. Please advise. Also, I`ve a lot of travel coming up in summer (domestic and international)