Multichannel amp s for an all B&W system?

I have an EAD Theatermaster Ovation Plus and B&W Matrix speakers (801 Series 3 mains, HTM1 center, SCM-8 surrounds).

I'm currently of the opinion that my Krell KAV-500i amp is the weak link in my system, so I'd like to upgrade. There's a slightly dark, mechanical, airless quality to the sound that I'd really like to get rid of. I suspect it's the Krell because that's exactly the sound I heard from the Krell Home Theater Standard pre/pro when I demoed it against the EAD Theatermaster.

The Krell amp is 100wpc and has great bass control. I'm seriously considering the EAD Powermaster amp, but I'm not sure if I should go with the 200wpc PM1000 or the 400wpc PM2000. Would the PM1000 risk sounding wimpier than the Krell?

What other amps I should consider? I'm looking for ones that err on the side of liquid, airy, and unfatiguing, but not at the expense of bass control or detail (isn't everyone?).

Thanks,