I agree with you that out of NTT, AT, IT, the NTT's are the best and seem to be more stable.
I had an awesome NGT but sold it because it wouldn't take shrimp, only to have the buyer magically get it on shrimp within a few weeks lol I haven't been able to get a replacement since.
As for your bichirs, if you're going with a 240g, then get all of them! You'll have plenty of room in that tank on the bottom.
Thanks for the info on the gold nugget pleco, I believe snookn had some, not sure if they're still in stock but I may have to put in an order with him.
I got an albino gibbiceps right now, but if I don't upgrade within a year or two I will definitely have to re-home it. I'm really enjoying it for now though.
A gar would go well with dats and bichirs too, even pbass du. I got some orinos because they replaced azul as my favorite because they have the blue with all the anti-freeze green color on the body