When I heard ''It's Raining Men'' by this duo last year, I wasn't impressed. So when I picked up its new record, I was not in a hurry to put it on the turntable. What a surprise! This album is a riot, a refreshing change from the usual pop album. The Weather Girls sing in a style reminiscent of gospel music, belting out songs about the search for the right guy with so much power that they sound as if they wouldn't need microphones at a concert. Although there are only six cuts on this record (one is ''It's Raining Men''), they are all lengthy and inviting. They jokingly brag in the record's title track of their recent success, ''We've reached the top, cream of the crop, and nothing's gonna make us stop.'' Then there is their well-orchestrated version of Rodgers and Hammerstein's 'I'm Gonna Wash That Man Right Outta My Hair'' (from ''South Pacific''). All the songs have a full orchestra backing the vocals, and good production values. ''Dear Santa'' is a hilarious letter to Mr. Claus with the simple request ''Bring Me a Man for Christmas.'' ''Hungry for Love'' puts the Weather Girls in a restaurant, demanding from the waiter some (you guessed it) men. There is one song on the album which is more serious and mellow - ''Hope'' - a nice contrast from the other loud, funky, funny songs on the record.