Best small office firewall?

I am in the market for a new router/firewall for a small office. I am
interested in security, security, security. It doesn't matter how complex
the thing might be, I don't want to cut any corners here, it needs to be a
really secure piece of equipment.

Small office, so while I don't want to cut corners, I still don't want to
spend $10,000.

Any tips are greatly appreciated.

THANKS!
--Dan