Which Int. Amp with passive ATC SCM40

Hi all.
Have had to down size from Mac C2300 + JBL LSR6312 (acitive) to an integrated with the now selected SCM40. The room is awfully small. Listening distance is about 7ft and speakers will be 6ft apart. 
Due to the compact placement, a sealed box would be best, thus these speakers.

Music taste runs from Slayer, Metallica, Rammstein to Enya, Patricia Barber, Mary Black, The Prodigy ... mostly the heavier stuff..

Please help me by advising which amp will smoothens the highs (most heavy metal recordings accentuate the highs) and give me slam

ATC SIA2150 (adv : same make as speakers)  OR
Parasound Hint 6 (adv : tone control, phono stage)

Thanks
Jagjag