We have developed/used a 16 channel portable system which consists of a laptop computer, a DC powered Magma expansion box and two NI PCI 4472 cards. The system worked very well for our NVH (noise and vibration) applications
NI PCI 447X is a 24 bit card and has built-in anti-aliasing filter, simultaneous sampling up to 102.4kHZ, and ICP power. It is excellent for measuring signals from PCB accelerometers and microphones.
For Magma PCI expansion box info, check the following link.
http://www.mobl.com/expansion/pci/2slot/index.html
Good luck
Ian Ren
Roush Industries