I don`t know that there is ever an easy answer to such a question. I would engage an attorney that works in the area of trademark law.
How much money would you lose if you were forced to close up shop?
My business can`t afford an attorney. I just opened and the business is not yet profitable. I`ve probably spent in the neighborhood of $2-3K of my own money in branding my product (incorporation costs, domain registration, logo design, packaging costs, etc...) This does not include the many hours of time I have spent in developing the brand. Also, switching domain names will set me back to square one in terms of search engines. I`ve proposed to Edson Wright that I switch my domain name to www.cozy-cookies.com. I`m waiting to hear what they think. We have a 3 hour time lag and have had trouble hooking up on the phone since neither of us man the phones all day.