My fiance and I are going to be applying for a joint credit card account to use for wedding related purchases. Couple of questions for those that know.

Our household income is 150K+, we own a home (less than 3 months), I've had my job 6+ years, she recently graduated from grad school and has been working months.

My credit score is above 750, hers is terrible (a little irresponsible in college). What card should we go for? Rewards aren't that important, I fly NW or Delta so earning miles would be a benefit.

Would having her as a joint applicant hurt our chances of getting the card? Would like to have her on there to help her credit score.