I'm really happy with my 350 to be honest. It's nice to dream about having a larger tank, however the: Maintenance, cleaning of acrylic, replacing of fish, etc... for those size of tanks being listed would be beyond what i'm looking to do on a daily basis with life going on around me. I do want to get the same footprint tank I have now with a 30" to 36" height for a more pleasurable tank to look at when you are in front of it. So, I guess a 96"x36"x36" 535 would be my tank I would want to get to replace the 350, however this isn't really a dream, it's more of a matter when will it happen and then put it into a wall in my house when I get it
Or a complete basement wall fully built in something around 2000+ gallons with rays and a couple large amazon cats and a FRT. Also with a section that is heavily wooded and full of rock for smaller fish and crawfish so it appears to be completely natural with all sizes of fish. $12,000-$15,000 will complete it with fish. It is very do-able I have to purchase a house with a large enough basement to do so