I would really advise against buying a cam based solely on the fact that you could view the pics in the field. There are many reasons I say that but the biggest reason is that every viewer I have ever seen built into the camera is too small to really see anything. Plus you can hardly see them in the sunlight. A better and more practical idea is to purchase one of thos digital picture frames. Bigger screen but still very portable.
Blessings........Pastorjim