Hello everyone

As some of you might have read my previous thread i am considering buying a snake. i am wanting your opinions on a tank or enclosure for the snake and although this may not be the result, I would like to buy just one for his entire life. Is there a certain size i can buy that would suit him well for his entire life or is it ideal to start small and expand as the snake grows? also, looking around my living room where the snake will be living if i could find a taller enclosure with a smaller width like some of these octagon tanks im seeing, would this be ok? if it isnt too much to ask you could post some pictures and specifications on enclosures for me it would be a big help! thanks guys