I have done lots do get the best you can afford. I would recomend the stuff that is like plywood the top layer is hardwood of what ever type you want. It is ment to be a floating floor so you have to leave a 1/4 inch space on all sides or else it will end up looking realy bad. All wood exspands and contracts do not use glue the person we bought this house from used glue and it looks realy bad. I have to redo all the laminate on the main floor. The plywood type and the laminet flooring is made to take on some moisture so put some plastic down where the tank stand is going to be, this will protect the flooring.
You can get clean plastic from fabric land it comes in different thicknesses get the thikest they have, it is a linal product. You also have to make sure that your floor is level no dips or rises as this will make the flooring look bad and it also makes instalation hard. If the floor has dips and rises get some self leveling cement and that will do the job then you will have to lay down a new underlay wood before putting dow the flooring but if your going to do some thing you might as well do it right. I got to the point that I could do a realy large living room in less than a day with trim, get the instalation kit it makes thing alot easer. My brother didn't while he started his floor I went and got my flooring tools that I was using for my laminate floors. I got back and he had only done 1 row we finished his kiten in about 2 hrs.

Bill