I personally don't care what information is out there. The only address anybody knows is my CMRA address, which is usually the primary concern of most with respect to giving their address to anyone, including a registrar to display on the whois.
That's for physical location. For communication which does not have any fixed location, namely email and phone, I hide nothing. It's all out there in the open. The emails are pushed to my blackberry, and my phone rings when you dial the number.
If you want to keep things private but not go to the trouble of incorporating, here's how I'd do it...
Give a false name on the whois, such as Wanda Anderson. If anybody asks, Wanda is your wife. She's a control freak and insists that everything is in her name. For whatever wacky reason; we'll say a prenup wasn't worth the money.
This way, when somebody inquires, addressing Wanda, you can just say "This is Wanda's husband, you can talk to me about the domains."
For an email address, I personally prefer the gmail type addresses, since if it's obviously not a big company owning the domains, I consider the
[email protected] bit to be a tad pretentious. Perhaps
[email protected] or similar.
As for the phone number, you do have to keep in mind that some people might call you to inquire. If you don't want to give out your regular phone number, you may want to look into an inexpensive cell phone, which can be had for as little as $15 per month, which will get you a working number to receive calls. Or even a Skype or Google Voice number. That could be easier.
I'm a privacy freak myself, so I've very strategically mitigated what gets known about me to people.
Hope this helps you out!