Glad to hear you're still considering DT's. I've owned about 7 different brands of speakers over the years. 1 of which was Klipsch, I have never heard Speakercraft's so I can't help you there. I just do love my DT's like you do it sounds like so if you were going to move away from what you love, I just think I'd really want to make sure it's the right move. So if I were you, maybe buy a Speakercraft that you have in mind, and just try it out to see how well it works for you before going full out and buying the whole set.
The theory behind aim able tweeters makes absolute sense, and I'm not knocking the concept, I just don't know as if it will make that
much of an overall difference unless the Speakercrafts really do perform as well as the DT's you love so much. To me the priority would be over the better sounding speakers over 1 feature that the other might have. But as I said, the Speakercrafts have gotten lots of good reviews so don't take what I'm saying as a bash against them. I suppose if you still have your DT's, you could always just try and place them how you would have them if they were actually in wall speakers. Put them on a ladder I guess and see how it sounds to you having the tweeters facing forward as opposed to down at you.
If all the speakers are exactly 9 feet high, with all the tweeters facing forward, then at least your soundstage will be consistent all the way around.
My UIW RSS's that I mentioned earlier, I actually had mine installed 10 feet high, but mine was a bit different as they were in the ceiling, which is not quite the same as being in the wall. But even still, they were not as optimally in line with my ears since they were not aim able, but I still was very impressed with how they sounded even still. Also keep in mind the overall placement and difference between all of your speakers. Mine were in the ceiling, but placement wise other than that, they were really well placed for where they need to be other than being so high.
As far as subs go, you can't go wrong with the recommendations that ack_bk has made. I've owned about 7 different SVS subs over the years. And liked them all.
My only knock with SVS is i think they're a bit overpriced for what you get. They've been around for a long long time. But there's just been other companies that have come along so they're not as competitively priced as they maybe should be. But, with the money you spend on SVS, you do get 1 of the best if not the best CS experiences you will ever have if the need arises. Their CS is that good.
There's about 5 or 6 really good ID sub companies out there so be sure to check out the Subs forum here at AVS. That's a whole lot more research to keep you busy for hours on end.
For my subs, since my room is so big (10,000 cubic feet), I really needed something to fill all that room. Duals was absolutely needed, and price was critical, so I went with what I felt was the best for buck subs I could get. I bought a pair of CHT VS18.1's. Awhile back I posted an amateurish type review of them if you're interested. Also I have pics of my HT set up with my in walls as well, if you're curious about seeing that as well.
You can find that here... https://www.chasehometheater.com/for...ead.php?t=4705
Getting subs that match well with your speakers is irrelevant. Any well made sub will sound good with any speakers regardless of what speakers you buy.