My insurance broker is the Equine Equine Insurance Center (http://www.equineinsurancecenter.com/). My policy is actually
through Great American. After the initial deductable, I was reimbursed 100% for all costs associated with my mare's check ligament injury last year (approx. $1,800). Unlike VPI, there is no "fee schedule," etc. They pay 100% of whatever your vet charges. They didn't cover the farm call fees, but paid for her ultrasounds, shock wave therapy, medications, etc. I was VERY pleased. My equine policy costs just under $500/year for mortality and major medical. The premiums vary based on the value of your horse and what they are used for. I think my mare is valued at $6K and is primarily a pleasure horse.
I'm going to check out PetFrist now for our greys... thanks! VPI renewal policy for just one of our greys was $483.