If the domain does eventually drop - don't expect to get it.
If the domain is even remotely interesting then one of the "snapping" companies will grab it.
They will register the very milisecond that it drops - an individual stands no chance in a race for it.
If it's obscure and nobody else wants it, then you should be OK.
If it's even slightly interesting and you really want it, consider paying one of these "snapping" companies to grab it for you.