No credit card required
Browse credit cards from a variety of issuers to see if there's a better card for you.
Best method is to pay at the end of the year. Why give the money to the IRS when you can collect interest on it all year?
I enjoy getting my refund in one lump sum at the beginning of the year. We're going to Hawai'i in March, so it's mostly fun money but a good chunk is going into my kid's savings account.