I have this load cell a
Bosche H30A - http://uk.bosche.eu/product.php?prodid=805 - Rated Output / Sensitivity 2,0 mV/V
and thought it is a good idea to use a
ADS1115 as ADC (16bit) - http://learn.adafruit.com/adafruit-4-channel-adc-breakouts/overview
so it is better than Arduino's internal 10bit. I thought the internal gain amplifier of the ADS1115 would be enough. But after reading this posting http://forums.adafruit.com/viewtopic.php?f=25&t=42455 I doubt that this is sufficient.