Spalted maple is a bit softer than non-spalted. Of course, once you soak down the spalting in superglue, it gets pretty hard...
Padauk will be fairly bright, but slightly heavier than you might think.
Walnut will give you clear highs, but may not be as bright as you want.
You have to be a bit picky about selecting maple. Not all of the varieties are equally bright. Quilted Big Leaf (Western) Maple generally gives me the most raw top end; it's a bit harder and a hair lighter than Eastern Curly. Quilts seem to be brighter than flames.
Hard rock maple is brighter, but noticibly heavier. As a lam-top, it'd be okay, but I wouldn't want to do more than about 1/4, or you'll start to loose low-end. It's really better suited for necks, where it's structural characteristics can be better utilized.
An exotic, Imbuia (Brazilian Walnut) makes for some really brilliant highs without sacrificing anything in the lows or mids. Very clean sound. Not as balanced as cocobolo or bubinga, but very nice nonetheless. But it's heavier than Maple or Walnut.