Pricing page: three tiers or "contact us"?

I keep flip-flopping on this. Three tiers feels transparent and lets people self-select. But every tier I add is another thing to maintain, another support burden, and a reason for someone to pick the wrong one and churn. "Contact us" lets me scope every deal by hand, but it kills all the self-serve signups from people who just want to try it. Half my traffic bounces before they even email.

Is transparent-but-rigid better than flexible-but-friction? How did you land on yours?