That is going to sound very good Cap, I am also going with the mini dsp. Will be using the 2x8 to keep the 3-way going up front. I know you are going to do a great job with this build, good luck.
I thought about going 3 way, but I'm going to build this one as an on axis 2 way. Those woofers and tweeters both extend pretty low, but 1" tweeters start beaming at around 12 as opposed to 3/4 at 18 IIRC. If I wanted to do it off axis so beaming isn't an issue 3 way is the best choice.
That is one of the main reasons I went that route, my tweeter placement is in the a pillers off axis.
That's what most people do with tweeters, but im going to do some creative fiberglass work to do some interesting things acoustically. I also wouldn't be able to use deep chamber tweeters in the a pillars easily.