Keyword research.. just checking

Im looking making a move into IM I think I have found a targeted niche, I have a few .com domain names available with keyword in the title and now I want to research the keywords a little more as Google Trends are all looking good.
I will use Google keyword planner but should I be looking for low competition words and what numbers do you guys look for in terms of monthly searches and value?
Is Google keyword tool enough or do you use another tool as well?
Thanks

See original post by UrbanColour