i like a low magnification for the woods 2 - 4 or so, higher 8 or more for longer distances like fields. thats if you get a fixed mag.
adjustable is nice. my current pair is a bushnell 7-15 i believe.
if your looking for a throw away pair so to speak, you can get tasco,bushnell, nikons etc pretty cheap, but they are not going to be the sharpest, clearest, most rugged.
the more you spend usually the better the optics are.
i like to look at binoculars as an investment. a good pair taken care of will last a long time.
also when in the woods, a larger objective lense will gather more light.