in-amp for strain gauge
Shopping questions area off-topic, but in general terms I would definitely go for one of the newer type of "zero drift" instrumentation amplifier that has a maximum supply voltage of ~5V or less. 

Go to either a manufacturer (TI, AD, etc.) or to a distributor such as Digikey and do a parametric search, then compare datasheets. 

A quick search yields, for example, the AD8237 which sports a 115uA current drain at 1.8 to 5.5V and 75uV maximum Vos.