TGX door speaker upgrade?

@Fridger can you recommend me a good subwoofer?

Sorry for being off topic. I’m looking for a good sub for my ride and can’t wrap my head around which would suit me best.

Do I need to spend over $1000 to get some decent sound? I’ve been reading the reviews all over the internet and I didn’t get closer to finding a solution. Plus most reviews are hype. Blatant copy of manufacturer’s features that’s it. Now I’ve found a different site which writes more on our language. Still there are 10 subs on the page and it’s hard to choose. This website different. What I loved about the reviews were that he highlights many negatives. Best of all they are not watered down.

What are the most important things when you’re looking for a sub? Any tips?