Thanks for help guys. As MarkT mentioned, with only 5V going in I will have 50% less voltage going out of the load cell. Lefty, Did I understand you correct, that gain on the AMP will take care of thatm how about resolution and noise? The cell is 1000N capacity, meaning that for 1N I will have 1mV (at 5V) going to AMP and I would like to get 0.1N resolution if possible.
Having that in mind, should I just use the amp as it is (let it provide 5V excitation) or boost the excitation to 10V externally?
I don't see a resolution issue as the amplifier you are using is analog and the adjustable gain will set the total voltage output measurement range the same no matter if you were using 10v or 5v bridge drive. The downstream analog to digital converter (assuming there will be one) is where resolution of step size is determined depending on if it's a 8,10,12,14, etc bit ADC converter, so it should be the same if handling the same analog input voltage range.
As far as signal to noise ratio goes, certainly the reduced bridge output voltage obtained (1/2) from driving the bridge at 5v Vs 10v, will be less, I don't think you will notice a difference at all in your real world measurements.