suphew - great post, sums it up.......
Its a waste of time looking at all the display tanks in most shops, without being willing to spend the dosh that they cost to setup, can only end in tears.
Its why at the budget car places they have all the nice autos out front, and the cheap stock in back..... hook the dreamer and close the deal!
I would say that a minimum spend is $1000, but if you are looking at any of the $5k+ tanks that members on this site have... why are you so smart that you can do it for less? don't even dream it will look like them, I have over 150kg of rock in my TANK!
DIY is cool and you can get some awesome results, but it STILL costs lots for the acrylic sheets, special blades etc etc......
I collect 3k worth of 2nd hand kit before I even added water.