reidmar 502

hi, choosing a new head and a bit got confused on Reidmar's specifications, the vendor doesn't list 8ohm power ratings and the thing about 'peak power vs RMS' also confuses me. what do I want/need: 1. 150-200W in a 8ohm 112 2. 300-500W in a 4ohm 212/210 or pair of 112s which of those heads...