I use Brad Callen's state of the art software - Niche Finder Latest Version *the only software that focuses on evaluating keyword difficulty by looking at the more important factors like page rank, total and quality of the competition's links*
0-30 = EASY.
31-80 = FAIR
80-100 = DIFFICULT
BETWEEN 30 - 65 = SWEET SPOT.
Get 25 lowest competition keywords based on your root keyword!
Also includes - CPC, Avg Links, Total Searches