You can ground yiourself on your PSU. Just leave it plugged in, but turned off (via the switch on the back).
I wouldn't really worry about it. Like Tealc said (not in so many word) your not really going to generate much static unless you put on rubber shoes and moonwalk for 15 minutes.
Most cases on electrical items are grounded. Just touch anything that’s plugged into the main and is metal
Correct me if i'm wrong, but wouldn't wearing rubber shoes be a good thing?
Thing is i'm not sure the 690 II actually has a part of the casing that isn't painted (black interior).
Wikihow said:Some people claim that damage can be reduced by wearing little or no clothing, it is said that the less cloth that is in contact with your body, the less static is produced, though these claims remain unproven.