Use Steinbergs Nuendo3 which supports 192Khz sampling rate. You want a
dual CPU AMD Opteron system and two super fast 10,000 RPM SATAII hard
drives (you should easily be able to record 6 192Khz tracks per hard
drive) (Nuendo lets you select a unique hard drive directory for each
audio track! RME brand ASIO cards that support 192Khz are the Firewire
interface called Fireface and the PCI interface called HDSP-9632. This
will do the trick at low latency and shouldn't even be that CPU
intensive if you don't have alot of native FX running.