Here is what I woulod do. If you are running only one sub I would put a 12W6v2 not a 10 but if you want the 10 that is you choice. For either of the subs I sould run a memphis power reference amp. They make a 500 watt mono block that would pound those suns real nice. You can't buy memphis online but you can check out their web site at
www.memphiscaraudio.com They also have a killer marine series. I usde to hate all these weak amps that cost and arm and a leg that were "marine" and did not put out any power. All memphis amps are great. If you want the marine they are great but if you want to save a buck they check out the power reference series.
This is a link directly to the 500 watt power reference that I recomend. I am running the 1000 watt mono to 2 kicker l5's and they slam
http://www.memphiscaraudio.com/products/details.asp?id=98 Also if you want one amp to run subs and cabin speakers I would suggest the memphis belle marine amp. It has 4 channels and one 600 watt channel for the sub which would be awsome. The speaker channels put out 55 Watts per channel. My buddy that installs these amps said that would be plenty for those Alpines.
As far as PPI. I have some of the older amps and they are sweet. But the main designer left about a year or two ago and they are not the same. They are still great amps but not worth the money. They should be about 1/2 the price they are right now
hope that helps
email if ou have any questions
Preston