just because the 8" W7 is in the same price range that doesnt mean its comparable..the W7 will have the best SQ because since its smaller it has a faster response....im not tooo sure on this but the H2 would probably get louder since it can handle more power since 1200 is a litle too much for a Type X
just because a sub can handle more power doesn't mean it is louder...look at the sx and the xxx the xxx can handle 600 more watts but the sx is louder because it is more efficent...
a 12" will get louder than an 8" in 90% of cases...especially when talking about the subs your talking about...I'd go 12"...the w7 is overpriced...get more bang for your buck with other subs.