I like to keep my portfolio diverse. I have 7 .net's & 5 .info's Been kinda eyeing some .org's, but re-sellability is relatively low on those right now.
I don't currently own a domain, but I know what I am getting when I get enough NP if its still available, and it won't be a .com, so I guess, my answer is 1.
Even though I've got a pretty desirous stash of ccTLDs, overall my non-.com names are a tiny portion of my portfolio. I own about 100 or so non-.com names total, out of about 900 total domains owned. Back when I started, I think inf my first 6 or 7 months, I had probably about 80% non-.com.
Yeah, I'm probably missing out on a lot of nice names just because I personally feel .COM's are the most professional and everything else comes in a very distant 2nd... a last resort for me to be honest.
I have my eye on a .cc though, and a while back I could have registered KR8.NET (pronounced create.net I guess), kinda kicking myself I didn't pick it up.
Could have got stockicons.net as well but didn't... oh well, I do own IconPacks.com and IconSets.com so decided I just didn't need that .net ... I think I look at names for development a lot more than reselling, that's why I have a hard time considering the other TLD's.