Oh geez, are you sure they were large animal vets? Small animal vets may not know what vaccines a horse needs because, well they don't ever treat them. If they were in fact large animal vets I would stay away, far away...
Do you have mosquitoes?
If so give West Nile and possibly E/W encephalomyelitis (or sleeping sickness) depending on your areas risk factors, these are transmitted by mosquito.
Do your horses have any chance at all of contact with wild animals such as raccoon, skunk, possum, coyote, or other common rabies carriers? If so give rabies, it is 100% fatal if they come down with it.
Tetanus should be given no matter what area, although there are varying opinions as to whether it should be given annually or every other year or longer.
Do you plan on hauling to any shows, trail rides, etc? if so I would consider Flu/Rhino/maybe strangles.
Flu/Rhino/Tet/SS (5 way) is a common affordable vaccination around here (Northern WI) Rabies and WNV are given separately.