You won’t be disappointed in any of these. The owner/creator of Audiofrog was the guru at Harman Kardon for forever. DD is a brick and mortar dealer only so that could be an issue (but solid products). SSA is obviously sold online at SSA.com.
What exactly are your goals? Or are you just looking around for the future?
My goals are to just have an everyday thumper. Not doing any events or competitions by any means. Just really love music and I love it to sound amazing. Nothing like pulling up to a high school kid and blowing his doors off hahaha. Hell I even have a bumpin system on my electric wheelchair (which I'm looking to upgrade as well lol). I listen to everything equally: hiphop, metal, country, classic rock.
I'm trying to decide what subs I want to go with. I've been back and forth so many times. I was originally thinking Skar EVL and the I found AB XFL. I was trying to choose between those, watching tons of YouTube reviews and searching google. I subscribed to many audio channels on YouTube to see what people were running and saw Sundown SA. Then I saw a review on the Skar VXF which looked pretty nice.
I'm not very rich but I want something that I can thump and is reliable. So far I've picked out:
HU: Kenwood Excelon DMX906S OR
Kenwood Excelon DMX706S(deciding whether I wanna drop another $100 to connect wirelessly)
Amp: Taramps Smart Line 3000w (figure whatever sub I decide on this should work for the most part)
Subs: I'm still back and forth. Do I get 2 12s on a budget? Do I run 1 12 and get something of a better grade and possibly add a second in the future? Everytime I think I have it picked out I fing something else. But at this moment I have these choices written down:
Skar VXF, AB XFL or HD or Sundown SA
Hope I answered your question hahaha