As you can see with my tank, your stock will work just fine. At times you may pick out a PITA fish, but all you have to do is sell it and get another. This is what I did to get the fish I have now. I would ditch the sunfish or give them their own tank. I had 10 longears in my 220 that were bigger than the Sals and choco and green terror and they didn't do so well, plus you will have to train them to eat pellets or whatever you feed your fish. Mine at shrimp pretty easy but that's expensive.
Any tank you setup, there can/will be a death. Happens to everyone whether they state it or not. That's just how fish are. I lost my Green Terror and male Festae due to this. It happens to everyone so don't let that discourage you. I try to stick with all South/Central/Mexico fish in the same tank but went to Madagascar with the Paratilpia's, which are mean as hell but my setup works, as you seen in my video.
Personally I don't care for tall tanks, my tank is 24" tall and my 265 is 31" I think, when you have a tall tank, all you need is a small step ladder, I use a step ladder when cleaning the 500 to reach the back, no big deal.
My fish utilize just about all the tank space, they don't just stay in one level of the water column, or tanks aren't that big for that to specifically happen, so again no need to worry about that. When I had rays I would see the cruise the top of the water in front of the circulation pump, my arro would be all over the place but mostly near the top.
I say go with what you want to do. You won't be disappointed.
