Hi Natalie,
I know this is not the answer you are looking for, but probably, the best solution is to call your local NI Field/Sales Engineer and explain him/her what you are trying to do. Also, it will be easier to disscuss price, performance and other parameters that must be considered when taking such a decision.(usually, his/her e-mail/phone is in the bottom-left page corner when logging to "MyNI" account)
Good Luck