Quad 12L, PMC TB2, or Harbeth Compact 7ES-2?

I am looking to match a monitor speaker with the Plinus 8100 integrated amp. I know the Harbeths are a jump in price from the Quad 12L and PMC TB2, but I wondering which speaker represents the best value, especially in terms of the sound of the bass. I am not able to easily audition these speakers. The room is 15'x15', and I will be adding a Rega turntable and phono preamp after the speakers. Thanks.