The 100k resistor should work fine. It'll discharge the cap to bellow 2 volts in 10 seconds, it will however constantly draw 1ma of power (about .15watts) So you could get away with using a 1 watt resistor with a 10X saftey factor, 5watts is 30X over required that's a bit overkill and I'm generally a conservative fellow but if that's what you got, use it.
If a longer discharge time is okay you could use a 1meg resistor. It will take about 60 seconds for the cap to discharge to 10 volts. The power used would be only .01 watts, you could safely use a 1meg 1/4 watt resistor for that. I'd lean towards the 100k resistor, but if that tenth of a watt of waste power bothers you 1meg would be better, as long as it's within your acceptable discharge time.