I wouldn't plan on any EQ, signal boosters, or high pass filters. That should help.Both of these changes would decrease my initial cost significantly
I wouldn't change driver plans....the Maelstrom just seems to be a in different league. If you need to go less expensive on the amp, I guess that would be ok initially, but I'd be a little weary of the low end FR of a plate amp. They typically have a high pass filter built in and it may rob some of your low end. Some have an adjustable center frequency for the high pass if you switch resistors.