I am looking at 2 subs for my setup you decide which one. I am getting the polk sub for Christmas but might return it and upgrade to the alpine for 10 bucks. 10 inch sub
If I were in your situation I would get a dual 4 type r and a kicker zx1000.1 Or you could buy one of my JL 1000/1 //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif But if you have the space available I would definitely port the type r.
Id go with the polk...they usually have great sound quality...ive never personally been impressed by alpine myself, but maybe that's just me..their stuff is pretty good though.
Well, I'll tell you the Polk stuff would set you apart from everyone else to a degree just because not everyone runs around with it (mainly due to the price tag that comes along with Polk stuff). But thats not a good reason to choose something over the other. Either way, you won't go wrong. Go with your gut when all else fails. I took a chance when I decided to give Polk a shot, and it just happened to payoff for me, but it doesn't always.