I use the A3cr pre/pwr combo with B&W 802 matrix series 3. I think they are a very good fit as long as I don't try to crank it to loud. The 802's are a demanding load. The MF has plenty of current but is only 120 watts. The 802's could handle more.
At any rate, I think the combo is very detailed and transparent without ever sending harsh. At current used prices the HT500 seems to be a steal.
Regards,
Paul