Fans have waited years for Rick Ross' inaugural offering, Port of Miami, to finally make its way onto record store shelves — and it would appear that those same fans couldn't wait another minute to get themselves a copy of the rapper's debut.

With first-week sales reported at more than 187,000, Ross' Port of Miami replaces the latest entrant in the imposing Now That's What I Call Music! compilation series at the top of Billboard's albums chart. According to the latest SoundScan figures, Ross' path to #1 was direct and virtually unimpeded, outselling Breaking Benjamin's second-place finishing Phobia by more than 62,000 units.

Ross and the Breaking boys were among the five newest releases to open in the chart's top 10, pushing Now to #3. With sales clocked at 104,000 and change, the compilation — featuring contributions from Kelly Clarkson, Ne-Yo, Sean Paul and Bubba Sparxxx — ends its four-week run in the top two.

The self-titled debut LP from Diddy-backed R&B songstress and "You Hear It First" alumna Cassie racked up sales of 100,000, to bow at #4 on the chart. Cassie is followed by another new entry, Slayer's Christ Illusion, which sold more than 62,000 copies during its first week out to take #5. While Christ Illusion earned the devilish metal icons the highest debut showing of their illustrious career, it's far from Slayer's best-selling debut: That distinction belongs to 1994's Divine Intervention, which opened at #8 with 93,000 scans.

The soundtrack to the film "Step Up" — which boasts material from Yung Joc, Chamillionaire and Chris Brown — occupies the #6 spot with week-one sales coming in at just over 59,000. The remainder of the top 10 is filled with familiar faces: The 10th release from the Kidz Bop Kids takes #7 with 56,000 units sold; Gnarls Barkley's St. Elsewhere slips one to #8 with close to 54,000 copies snatched up; DMX's Year of the Dog, Again falls from #2 to #9, selling 47,000-plus units; and Nickelback's All The Right Reasons rounds things out at #10, with sales of close to 47,000.

In all, 19 fresh releases crack Billboard's top 200, including Hellogoodbye's Zombies! Aliens! Vampires! Dinosaurs!, which opens at #18 with nearly 38,000 in week-one scans. Ozzfest vets Unearth take #35, selling 22,000 copies of their latest outing, III: In the Eyes of Fire, while Ani DiFranco's Reprieve pops up at #46 with sales of about 18,000.

The Jonas Brothers' It's About Time lays claim to Billboard's #91 position, selling 10,000 units, while the self-titled debut from Under the Influence of Giants claims the #134 slot with more than 6,000 copies sold. Gin Blossoms return to the chart at #159 after selling more than 5,000 copies of their latest, Major Lodge Victory. Todd Snider's The Devil You Know checks in at #173 with nearly 5,000 scans, just 100 copies ahead of Masta Killa's Made in Brooklyn, which scores #176. B.G.'s Play It How It Go debuts at #191 after selling more than 4,000 copies. And just making the chart cut at #200 is Waterloo to Anywhere, the debut LP from "You Hear It First" artists Dirty Pretty Things, which came up one disc short of 4,000 sold.