You need to give a better idea of the signals that are involved, whether signal conditioning will be required, how you are going to sample these signals and what sorts of sample rate you are expecting. Also, you need to identify the form factor that you will be comfortable with, any maybe the OS you are going to use. After you have all this information, you can visit the
DAQ page, and search for the right device under 'Find the Right Data Acquisition Device'. If you still have any questions, I would recommend calling the sales team at NI, and maybe having a local sales engineer come and visit you.
