Suggesting that ABC may want to think twice before paying Jay Leno gazillions to take over its 11:30 p.m. time period when he leaves the Tonight show next year, its relatively low-budget Nightline managed to beat Late Show With David Letterman last week for the second week in a row. Moreover it was within striking distance of Tonight among adults 25-54. According to figures released by Nielsen Media Research on Thursday, Nightline attracted 3.08 million viewers, 1.38 million of them 25-54 years old. Late Show drew 2.95 million viewers, 1.22 million of them 25-54. Leno remained No. 1 with 4.34 total viewers of whom 1.77 million were 25-54.