Amps suggestions for ATC scm 40 mk2

Hello all, 

Firstly, I know some of you will say that if it is atc go with active, but ı went for passives because of money. Anyway, I have hegel h160, 150 watts into 8 ohm loads, it is generally good, but in some tracks which has especially high dynamic range ones, i feel it lacks some power to drive 85 db speakers. I know atc loves lots of  power, so i m waiting for your suggestions. my budget is about 3k$. By the way I can use hegel h160 as a preamp, with a new power amplifier or a new integrated. Thanks.