.us sites?
 

Are they possible to turn into a success or are .com's the only way to go?

Depends if you want to target local only and the keywords hopefully only one but i would recommend buying a dot com over anything even if you need to buy a parked name.

.com is still king :thumbsup

I like .net and .org next, and for adult I also like .xxx

.us is the country code for the United States

there no privacy, you have to use your real name and or company in the whois info

Yeah, the privacy thing sucks. Otherwise they work fine. The coms will take all the typeins, though.

I would rather go for a .net or an .org.

.US is most effective, in my opinion, when the TLD is read as the word "us" -- as in "we belong here" or "this is our site". That doesn't mean it will be easy to rank high in search results when competing in a tough niche. And I would still recommend backing up the Blah.US domain with a corresponding BlahUS.com. All I'm saying is that the brand name can be quite strong with .US in some cases.

If you decide you want to go for a particular .COM but are concerned with the cost involved, I may be able to save you money, by the way.

I don't like .us sites. .com's are far better even for SEO.