Exactly!
The Doria isn't going anywhere, sure parts of her are collapsing, but it's not like she'll be gone in a few years.
You're much younger than a lot of us here, you have plenty of time to make it to the deep legendary wrecks.
As someone pointed out earlier, you're at least a few years away. If you really plan on going the CCR route, you're even further away, as you're required to log a lot of hours on any given unit, before even starting the Trimix training on it.
Also diving in the cold/dark NE waters is a hell of a lot different than the diving you're doing down in TX.
I've been diving dry for about 1 1/2 years, Nitrox for about the same, and doubles since the begining of the summer. Just dove the Bass a few weeks back and that was an accomplishment in its self for me.
I'd be interested in someday diving the Doria and the 869, but that's pretty far away, if I ever make it. Before I even think of any tech training I just want to get a lot more experience in the Atlantic. Also there's a lot of really cool wrecks out there that aren't that deep. For example can't wait to make it back out to the U-853, and would love to do the Bass again, also The San Diego, The Oregon, The Stolt, etc.
The reason I stumbled into this forum is regardless of if I get into REAL technical diving, I'm really considering going the CCR route. With all the units out there and all the information, it will probably be at least a year before I even decide which one to train on. And probably a few months after that before I'll be ready to even dive it on the shallow in shore wrecks around here.
My point is:
I'm further along in my training than you, have more experience in conditions similar to what you may experience on a wreck such as the Doria, and also a lot older than you (less time)...and I have some of the same goals as you, but I'm not in any hurry. If I'm lucky I'll have my rebreather by next year. If I'm really lucky I'll have enough hours on it to be doing some REAL dives off NJ with it.
Take your time!