This 70,000 offer on the United Explorer personal card is the best we can remember. It is a tiered offer of 60,000 points for $3,000 in 3 months, and 10,000 more for $6,000 total in the first 6 months. Keep in mind, it has to have been at least 24 months since your last BONUS on this card to qualify. Other United cards won't preclude you from getting approved, within reason.