On the CN NEAF review pages there is a picture of a new cube that can handle 25lbs. I think jjjnete has one and so does Alan so perhaps they can provide some feedback.
New Cube "Mini Tower"
http://www.cloudynights.com/ubbthrea.../o/all/fpart/1
http://www.gotonova.com/Chinese/Prod...?ArticleID=161
Regards
Fahim