lol i have no clue since i have absolutly no idea what the next systems are going to be!!!!!!!!! and unless you have some sort of secret sorce neither do you!
but theres absoslutely no doubt, that the coolest system is: Meet the Blue water. the newest in supercomputers, with a peak datarate of 1,7 petaflops, and if the power is matches in graphic cards, you have a computer that can take crysis on more that 500 frames per second! thats on heavy soab!
maybe a touch computer that like if u put ur ipod on it ti opens itunes and if u put a camera on it it syncs photos onto a folder and other things like that
set it up on your CPU have some sort of treadmill thing set up on the floor and move your feet on it to resemble walking. Have the treadmill thingy circular so you can move in all directions. As for using your hands for something, i have yet to get to that.