In low voltage solid state circuitry 100 ohms is generally thought of as low, 1M is high, and the normal range is 1k..100k for many purposes (opamps, pullups, voltage dividers, etc). The underlying reason is that as you get below 100 ohms or so power dissipation becomes important, and above 100k noise-pickup starts to become important.
However at higher frequencies things change, much RF stuff is 50 ohms and 1k is a high value!