This one is right up my alley. I have owned Triangle Celius and currently own a new pair of Antals. I have extensive experience with Magnepan MMGs, 1.6s, 3.6s and have a new set of .7s on order. I also have a Parasound A21, and have experience with the JC1s. My Triangle Celius 202s with tube amps were magical with a beautiful sound stage and bounce but they had the same limitations you describe, lack of powerful bass and a limit on volume. However, when matched with a pair of proper subs I was satisfied with what I was hearing, perhaps my best system to date. You should be happy with your system.
Magnepans offer a bigger and deeper soundstage but can be difficult to set up and get everything out of them. You should only consider the model 3.6/3.7 system or better. The true ribbon tweeter is perhaps the best in the world but it will have to be to compete with the Triangle tweeter. If you can get them set-up right (the right room with the right placement) the Maggies can be very good, set up wrong and you’ll be hating life. The big panel sound is hard to resist and that is where I have found the most joy but it may take some hard work to get the Maggies to the level of your current Triangle system.
Magnepans offer a bigger and deeper soundstage but can be difficult to set up and get everything out of them. You should only consider the model 3.6/3.7 system or better. The true ribbon tweeter is perhaps the best in the world but it will have to be to compete with the Triangle tweeter. If you can get them set-up right (the right room with the right placement) the Maggies can be very good, set up wrong and you’ll be hating life. The big panel sound is hard to resist and that is where I have found the most joy but it may take some hard work to get the Maggies to the level of your current Triangle system.