Here's a useful tool to see what keywords might run you in other PPCs. Just plug in keywords and a maximum bid for each. By return email you'll discover where your proposed max bid would slot you in the bidding hierarchy. Makes it easy to find the lowest cost PPC deals. Put on your thinking cap and come up with relevant two and three-word phrases.
Phrases have fewer total searches.
Bids for those top spots cost less. And they usually give you better click-through rates. The best tool I've found for coming up with phrases is the new and improved keyword wizard. Just eliminate one word suggestions and in a matter of minutes you'll have tons of search phrase possibilities. Return On Investment.