I think MTX may be a bit over-rated. I would prefer Kicker over MTX.
On the other hand, I had just about forgotten about Clarion! Clarion may be under-rated! I was curious, so just took a look at Wiki. Looks like Clarion is actually a Hitachi brand and now Foxconn also has a share. Hitachi knows a thing or 2 about audio (understatement).
Before I got the Clarion, the last I had known of that brand is that it was relatively low end kind of kmart brand back in the day, and then it got better in my years away. Interestingly enough, of all the marine stereos we installed, the Clarion was actually one of the more durable brands with the least amount of failures.
When I got it, it had more rms wpc than some of the top names at the time. The only downside was that it was one of the last cassette models (and it was a sort of pearl white color for marine), which happened to be good for my rough riding truck by chance. It was fine as long as I didn't leave the cassette tapes in the hot cab all the time. I was really surprised how good they sounded in the boats we installed them in so I was glad to get it for my use. Besides, it was brand new and free, came with a remote etc.
The MTX speakers came with the truck. I have another similar enclosure at the shop that has cutouts for 2-12" subs. Although, I am looking at building something myself for perhaps a single 12".
There is a lot on youtube etc about car audio building. Again at least as challenging technically as home audio. It didn't used to be so.