Quite honestly I think it's the buyers with a bigger FB score who are more likely to know how to game eBay's system. If your zero buyer is a true newbie, I expect he may be just as nervous about this purchase as you are. Mind you, a new eBayer could very well have experience buying elsewhere online, so the eBay FB score may be meaningless anyway.
Nonetheless, for a ca. $600 item, it's worth the "belt and suspenders" approach -- send with tracking and signature confirmation, and insure the item for full replacement value. You can purchase 3rd party insurance if you like, which I find is generally cheaper than Canada Post insurance.
I find it's a good idea with new eBay buyers to take charge of communication immediately, by thanking them for the purchase, telling them what my shipping timeline will be, and reminding them that they can expect to have to sign for the parcel (to be certain it gets into their hands personally). Tell the buyer the item will be going with full tracking, but don't mention insurance in advance, just in case that gives him ideas. The insurance is for your protection, not his.
Personally I wouldn't judge a buyer by a Google search of his address. You can Google it if you like, but I wouldn't tell the buyer I'd seen his house or mention any details. It's just my opinion, of course, but I think that could be perceived as a veiled threat, and certainly to many people it would smack of spying. It could make some buyers feel very uneasy and less likely to trust the seller. It would me.
By the way, one of my best repeat customers lived in what looked like a rather run-down, small bungalow on the outskirts of a mid-sized U.S. city. And some of my best buyers have been newbies. You just never know. Protect yourself as best you can, communicate and explain to the new buyer how things work, and then try to relax -- you've made a good sale.
