[Mike P.]

If a plate amp is what you want you'd be better off spending a little more money and getting the 1000 watt amp. It will give you the headroom you need.

 

[Mike P.]

What box volumes are you modeling for the ported and sealed?

 

[Mike P.]

Here is some "ballpark" modeling as WinISD doesn't take into account power compression.

Yellow is the Maelstrom sealed, orange is the Maelstrom ported and green is the Tempest ported, all allowing for sub displacement, bracing and porting in the given box sizes. All with the P.E. 1000 watt plate amp which has a 3rd order Hi-Pass filter at 18 hz.
Although the ported Tempest and Maelstrom are close in output, the Maelstrom does it with a lot less cone excursion and you have the option to upgrade the amp in the future to maximize the subs capabilities.

 

[Mike P.]

Let us know what sub you decide on and we'll figure out the porting.