I understand that it's the .com extensions that are normally the most highly valued, and that some domainers won't touch anything else. But, there are factors that may alter some peoples' views of which extensions to go for, especially for end users. These include such things as relevance to the type/name of business, whethr the name is likely to be found in search results, and price. In my own experience over the months I've sold quite a number of .info, a .cool, a .co, a .org, and a couple of .coms. Which, to me, just shows that it can pay to have some variety of domains in your portfolio, and don't be too quick to prejudge what will, and won't sell.