longer circ's rather than shorter ones are better for socks!
its hard to work with very short lenght circular needles..
but if you learn magic loop, and use a 1 meter (or so, or longer!) long needle, its quite easy. or use 2 circs,and then 24 inches (60cm?or so to 90cm (32inches) are good lenghts.
i tend to do socks 2 at time on 2 circ's --most of my circs are between 24 and 32 inches long, and i didn't want to buy new ones. but i have set of size 1's (2.25mm) that are 1 metre long, and i use these for magic loop)