I can relate, peacock bass rate extreamly high on my list, I have seen them in the LFS before and they were tempting, my largest tank is a 75g so it is completly out of the question. Some day I WILL have an indoor pond and I WILL get peacock bass. What I do hope to do someday is get the 1000g round fiberglass trout tanks they use in hatcherys and use that for em. The tanks are not cheap but they gotta be cheaper then a pond and at least if I move I can take them with me.
I almost bought a dovii once and kept him in a cattle water tub, of course I snapped out of it and didn't do it but yeah...I have been down your road before. When you want a fish bad enough you try to think of all the possable ways to keep it. But then I look around my house at the fish I do have and tell myself that for only keeping fish for 4 years I am doing pretty darn well and I need to just slow down and enjoy what I have. I remember when I wanted an oscar sooo bad, I thought I would be satisfied for a long time...not only did I eventually get the oscar but I got a second a year later. At that time I had only two tanks, one was a 5g...now I have 8. I just need to look back at when I got my oscar and how great it was, remember that I got what I wanted and I am lucky enough that I was able to and enjoy what I have till it's gone because some day it will be.