AD8058 has issues with high gain.. not sure why I'll figgure this out later. (up to 70mV on a gain of 5)
For now, I've completed this..
LM6172/LM6171/LMH6321.. impressions later..
Runtime 5xAAA NIMH - 7.5~6 V at 24 hours- with charger.
Size.. see pic.
Sorry about cameraphone..
Also, DC jack not yet soldered.