I was quite surprised by the statement of the EFF that .at allows hiding of personal info (unless a trustee is used). My impression, from personal experience, is that this is not the case. The NIC-AT WHOIS policy also seems to indicate that the WHOIS data will be public [1].
Most of the others limit arbitration-related takedowns to trademarks. I would be wary of those which allow broader takedowns.
.at hides personal info. .is seems to make name and email public. .de seems to make name and mailing address public. .ru has "normal" whois.
As a Canadian, I'm not at risk for a Canadian trademark takedown and individuals have their Whois data hidden so I prefer .ca to .com/.net/.org