Hey, being a Carpenter for a about 10 years and actually going through this dilema a few months ago, I can tell you from personal experience that a raised wood floor is the way to go. It does not limit you as to what you can do with your basement floor finishes. For example, with a slab you are limited to Vinyl sheetgoods, ceramic tile, wall to wall carpet,but, with a raised floor (either sleepers w/ 3/4" ply on top,or, floor joist then the plywwod you a have a wide variety of choices such as hardwood flooring, which provides a unique look to any basement, or any of the above types of flooring. But the real advantage is the ease at changing these with the age of the house. You keep the slab and everything except carpeting is going to have to be cemented down to concrete, tough thing to change once that grout, glue, cement sets up. Much easier with wood, and if you damage a piece of plywood tearing old flooring up, no big deal.