I suspect that a number of integrated amps have the sonic of separates, or may even be 'better' than the corresponding separates. This is because sometimes integrated are designed by. . . integrating existing separate components into a single box. . . and sometimes with some additional goodies not available on the separates thrown in for good measure. You mention a few brands, including my personal fav brand Rowland. . . but you do not mention budget, power requirements, the rest of your system, nor your sonic taste or musical preferences.
Guido
Guido