I see these 'if money were no object' threads... If money were truly no object, I wouldn't have a tank.
I'd be sailing around the coral triangle in one of these:
Big reef tank? Why bother, when you can dive from your back porch anytime you want. That's a Seawind 1600, in case anyone wants to take a closer look... and you may one day wake up to find that old Greybeard has swapped his home in the country for a 50' blue water catamaran and a slip in Penang
Now, back to the original question...
There is such a thing as 'right size'. It's a personal thing, and each of us are different.
What do you want to put in a tank?
How much time and effort do you want to put into maintaining it?
All of us have space and money restrictions... refer to above
For me, my 60"x30" tank is plenty 'big enough'. It's 18" height and low stand, open peninsula mount, and 'sump closet' provide easy maintenance and keep me from ever needing to work from my knees.
It's my 'right size'. I'm quite happy with it, for now...