NOTE - APPLY DIRECTLY THROUGH the NFL Extra Points website for a 20,000 point sign-up bonus (=$200). CK only gets you $100! So, go double your take directly. CK has some great offers, usually comparable/equal to, or the best... but before you hit "apply" for any card here, do go surf the web for better!
I got approved in seconds with a 643 (Usually much higher, but I have high utilization right now since it's off cycle, showing at ~80% though I just paid everything off like I do every month... so I was not expecting instant approval). I do have decently high income - $80k. Note, they ask for PERSONAL income, not household. Somethign to consider when applying.
I got it for my other half - you can add an authorized user and they report on their credit as well. We're building his by sharing mine. Capital One does this as well, while others (my credit union, B of A, AmEx) do NOT do this.