I've tried a lot of website's & software programs trying to find a good keyword in a vary competitive market & there not showing much. What's some of the best website's or software programs that are trust worthy. That also allows you to put in different keyword combinations for .com & .net domains that are not on a high priced auction site.
I got my own software developed that gets me emd keyword with low competition. There are many softwares such as micro niche finder and shark niches but they carry monthly subscriptions. I can help if you are interested in EMD keywords they are very easy to rank check the link in my sig for more info.
You can try out Generic Domain Finder for that. Basically, you do a search on a keyword, and it returns back a few hundred related keywords, and checks the .COM, .NET, and .ORG availability for you: http://genericdomainfinder.com/ There's also a good tool for searching through dropped domains, that haven't been re-registered yet. Sometimes you can pick up gems that way, for just the reg cost: http://genericdomainfinder.com/droppeddomains Basically, the most competitive domains get snapped up by drop catchers within seconds of dropping, but out of the second tier, you can still pick them up a few days after dropping. Use the filters on that page to only show unregistered domains.