TUESDAY AFTERNOON QB: Based on Monday one-day sales reports, look for Cash Money/Universal Republic rap star Lil Wayne’s eagerly awaited Tha Carter IV to debut a week from today with between 850-900k, which compares very favorably to the record-shattering 1 million he scored back in June, 2008 for Tha Carter III. WB rockers Red Hot Chili Peppers’ I’m With You will bow at #2, with between 190-220k in sales, less than half of the 443k sold by 2006’s two-CD set Stadium Arcadium, which went on to sell 2.35 million to date. The single, “The Adventures of Rain Dance Maggie,” is #1 at Alternative and Triple A and Top 5 at both Active and Mainstream Rock, while the band remains a sell-out arena attraction. Keep in mind several caveats, including a Monday release date, heavy frontloading and the lingering effects of Hurricane Irene. Other releases hitting this week include RCA Nashville's Jake Owen (45-50k) and Capitol/EMI’s David Guetta (30-35k). (8/30p)