Only consider using those if they really go along with your name.
If you're planning something that relies on a lot of traffic anything else than .com is risky if you ask me.
I'd rather have a longer name and use .com than .net.
Of course if I could get a great, short, catchy .net domain I would. But these days it's not too likely, so the chances are that whatever you're trying to register is already not that great so you can still rename it.
Whenever I see a non-com link it gives me the feeling of it being a B-class website. No matter how un-true it might be that's how my brain works.
