Speaker write up eh? System design is very dependent on the available speakers and preference for equipment or install.
Matt comes from a different perspective of audio than me but he definitely knows a thing or two. I would suggest maybe putting together a specific system for our vehicles based on the science of audio that would actually be beneficial for members. eg. buy this that and the other, put it in as described, use said settings for tuning and you're golden. Downside is you'll have to do exactly as the write up says.
The bottom line is that your system is only as intelligent as the application of knowledge. You can give a monkey the best shop in the world with some high dollar engineering plans and it still won't amount to anything special. Sorry, not trying to put the community down but I've seen some nasty installs, including my own.
My approach was "screw installation" and I'll fix everything with processing. I was right and wrong. It was good enough for everybody else, just not me. I'm going to go back through and possibly refab for a very good installation. But DESIGN IS KEY!!!!
You can't design unless you set monetary goals and decide how deep you really wanna dive into the matter. On a side note, we have one of the worst interiors I've seen for car audio. Our subs are so far back in the vehicle that we only really experience a little of the lower frequencies. Transparency is a word thrown around without much understanding. A good transparent sub allows you to stand next it but still not be able to realize the sound is coming from the speaker. That's pretty tough to accomplish guys. That's why mid bass and speaker selection can be such a big deal.
When was the last time you sat in person's vehicle and it sounded like the sub was in front of you somewhere? The drummer is in front of you...not behind you.
Good luck with the install and figure out your audio goals vs monetary goals. We'll give you better answers.