Obviously I would use Pheonix Gold MS2250 which would do more than 1000 watts into 2ohms and pull near 100 amps of current.
To pull less current use a class D amp.
Xtant 1001 if you get it or MTX 1000D.
The PG is a class A/B amp which sounds better than a class D IMO.
Slope depends on the speaker, not the amp.
I had a MS2250 and two MS2125's at about 160 amps (music) and 7 batteries with stock alternator.
When the system volts gets low turn it off.
Pulling this much power with a stock alternator you still can drain the batteries with the vehicle running.
A 130 to 140 amp alternator would reduce the number of times you have to turn your system off to prevent battery drain.
But at 100 amps you may not have this problem.
