directwheels - 4:02 pm on Nov 11, 2010 (gmt 0)
Forget paid-placement ads (way too expensive)
This may or may not be true. Believe it or not, there are still wide opened niches out there with little or no competition. Or sometimes, your competitor might have no idea what they are doing with PPC, leaving room for competitors to squeeze in. I purposely look for these opportunities to enter any niche markets and it has worked out for me.
Overall, I would say not to rule anything out and test everything within your budget.