Another option is something like this:
Data Acquisition Starter Kits
I bought an 8 channel one for miscellaneous use.
Funny you mentioned arduino. It has data logging capabilities and I bought one (now have two) and did a little reading on using it to collect data and daisy chain it to the lm2. That project is on hold.
I can verify that the arduino can use an sd card to store logged data. The mega has more inputs than the regular arduino. It can also do calculations and provide outputs so you could program it to activate a light or buzzer if it exceeds some parameter.