The 8 won't be any more SQ oriented than a decent 10 or 12. There are a lot of people who swear certain brands are better than others. Just get what you want to get, and pay attention to the install. If you go with an 8 instead of a 10 or 12, it's generally going to be because of lack of space, or you don't want to be too loud, or you just want the cool factor of having an 8" badass sub.
No matter what way you do it, pay attention to the install, and you'll be happy with just about anything.
T.J.