The need on the market rises for high density devices, more ports, NAC capabilities, maybe some Basic routing. In my opinion it could be a great idea to build an chassis to take up to 7 "modules". This modules could be C or B-Serie's without chassis and powersupply to put it in, like Cabletron did it in the 1990's with the 6H252-17 vs. 2H252-25R. What did you think about this? The benefit is having a full power redundacy chassis with 3, 5 or 7 slots, easy to maintane and expand.