I would go with the w7 ten times before I put in two type r's. Dont get me wrong I have worked with the type R's and they are a good sub but if SQ is what you want go with the w7. I would put it in a sealed enclosure if you are building it. If you end up buying one I have heard great things about the snailshell's. I would stay away from the Audiobahn and go with the Phoenix gold but thats my opinion. 4 guage should be fine but I would run 2 guage.
I agree with james. The w7 will be your best choice. It gets a little pricy but it's worth it. Go with the phoenix gold and 4 gauge would be ok. You wouldn't have to go all the way to 0/1 though. 2 gauge would be nice if you wanna spend a little more.
thanks everyone. infact i already have the w7 and the type r's so it was just a choice of which ones to put in and which ones to sell!
i really appreciate your input and i'l check out that snailshell encosure. 2 gauge sounds nice to me! one more question though. since i'm running 1000-1500 watts to the w7, what kind of cap or bat should i use?