This is going to sound like a cheap shill (and it is) but I *do* use Keyword Elite (see my sig).
It can be a bit slow, but its a "fire-and-forget" weapon.
Just crank it up and let it run. When you come back: BLAM. Thousands of niche keywords, and a website template system to deploy pages.
Yes, it is slow, so I just run it at midnight before bed and look at the results over coffee the next morning.
I have to agree with a previous comment that higher paying keywords are more valuable.
Its all a matter of ratios.
For me, I won't touch a keyword unless its paying
at least $3 for the top bid, a minimum of 1.0 or better SD, and I can actually afford to send traffic to it to make my ROI minimum.
Then I spit out the template from Keyword Elite and create the folder -
instant niche site. Finding niches that get past all my filters is slightly more time-consuming, but
far less frustrating than "hunt-and-peck".
So go buy Keyword Elite now using my link in my sig, fuckers