fostex vs accuton - same speed & accuracy ?

i like the speed & accuracy of accuton / thiel ceramic drivers. as my hearing ends at 14khz i thought about a 2.2 system with 5" wideband satellites (150Hz-15kHZ)(i like weight delivered with speed) for better imaging and 2 ultrafast and accurate (small) subwoofers down to 30Hz (isobaric twin 6" ?). is there such a ultrafast system on the market ? ceramic drivers are known for their limited bandwith - is there a wideband driver on the market which can meet the accuracy of accuton and 150HZ-15KHZ?