Aquamedic is a good pump. U can check with our sonsors, bio ocean, which carries OR6500. Price is about $400 plus minus, can't remember the exact.
The wattage is low
Doesn't generate much heat
In or Out sump pump.
Eheim 1262 is 3500l/r x2 means got 7000l/hr. sld be more powerful than a single or6500, but of cuz wattage higher.