I agree with you, the Novak dont offer much more than the Rayspeed - except for a techno look and a higher price. Personally, I dont find it worth spending the extra cash, I tend to say it's more about preference, than actual performance.
The MuchMore aint got a auto cut off.
I find the Rayspeed is the one with most value for money. But I also suggest you check out the Robitronic: 1 amp discharge rate (fixed), 0,8 volt auto cut off and control LED's to ensure that each cell is connected properly. The price is reasonably. So if you dont need the 5 amp discharge rate, you can save some cash.