I personally like the lurkers because where my tank is does not get high traffic so Im not looking at them all the time. If it were in my living room I would probably want something more active for sure. My hairy puffer is in the home office which I really only go in once a day, if even that, so having the fish fairly inactive works for me. But from what Ive read my hairy puffer is fairly active compared to some and definitely more active than most dragon, Congo and arrowheads.
I personally love the look of the arrowhead and want one and if I did it I would give it a 40B just for the ease of maintenance. More water volume just makes keeping the tank so much easier to me. I like the dragon/humpbacks too and would likely just put in in my extra 65B with an Aquaclear AC110 on it if I did one of those. But I like the extra space and I do over filter.
Gabriel_Martucci
Keep us updated on what you decide and put some pics up if you get one.