We have a 1907 house with hardwood floors and are renovating the kitchen. The existing kitchen floor is 2-1/4" maple and is beyond the state of refinishing...the rest of the house is 2-1/4" birch and is in pretty good shape. We'd like to leave the existing 1x8 subfloor intact (there's a whole new set of problems if we remove it), screw down 3/8" plywood to reduce the squeaking and help in leveling where the foundation is buldging, and IDEALLY install a nail-down or stapled pre-finished engineered maple floor. We had planned on using Bruce but have recently heard poor reviews unless it's glued, and we'd rather not do that. We're installing the floor ourselves, are open to other thicknesses (with a threshold), could finish it if we had to, would even consider throwing out the idea of wood altogether, but haven't been convinced of any great solutions. Any bright ideas?