Nope, not unless you have permission from some governing entity which protects the arowanas. I might be wrong about this, but I'm pretty sure that you can't simply breed them willy nilly. If you did breed them at home, they wouldn't be chipped, thus they would be illegal and nobody would want to risk buying/ owning one.
Rays are nice, but better in ponds I reckon, not really tank fish, simply because of design. Gars are awesome but once again, either a big pond or a decommissioned swimming pool haha. What attracts me about aros is their shape/ colour/ swimming style but most importantly their personality. My tank is in my room, positioned about 3m behind my desk. I swear that every time I turn around and make eye contact with my aro, he stops swimming and comes as close as he can to look at me. He even does the S-shaped swim to keep my gaze. If I hide in another corner of the room where he can't see me, he just swims normally. I just don't see a ray having that kind of personality, despite being really cool fish..