to get a long use out of it then it is best to invest in one that will last.
another thing to consider is where to position it, if you have a few spaces to choose from then you want one that is not always going to be in shade, has easy access (or can easily have paths built to give access) and, to make things easier for you, not too far from the house if you are to run water and electricity from there. though there may be times you are limited in space and only have one particular area it could be built.
once the position has been chosen the 