Casio can make keyboards with 88 keys, fully weighted action and speakers, which weigh about the same as the Tyros2.

Problem is that few manufacturers can see a market for a full-featured, quality, low-weight 76 note keyboard. It's obviously not hard to do based on current technology and manufacturing processes. But if they thought they could sell a zillion boards then you would already see plenty of 76 key models all over the place.

Personally I prefer 76 keys or more, but when it comes to weight I'm with Scott. If it's too heavy I ain't luggin' it...........

Give me a Tyros 2 in a Casio PX chassis = 88 keys and all the bells and whistles under 30lbs!

kind regards,
Mark