Tips for US Bank Recon Line for Larger Starting Limit?

Hi all,

Recently got approved for the Shield with a $2000 credit limit, and I'd like more. My general stats are 723 FICO, 47% overall and 1/24 (this application being my first HP in 2 years). I dug myself out of a big hole the last 1-2 years (i.e. 80%+ UTIL, horrible FICO, etc.) by working hard and paying off debt aggressively.

I'm wondering what I should answer when they ask me what I want the higher limit for, given the truth that I really just want it for the long 0% period. I'd appreciate any thoughts from you guys on what I should tell them.

Thanks in advance!