The three meds that I mentioned (Interceptor, Sentinel, & Advantage Multi) are all heartworm (HW) meds. So you could switch your dogs to one of these after your current supply of HW meds runs out. Keep in mind that these products will be more expensive than your current HW meds. In the mean time, I would ask your vet if he can worm your dogs for whipworms since they were exposed (sounds like you are already planning to do this). However, I see no reason not to use up whatever HW meds you have since you paid good money for them, right?

There isn't one drug that can cover all known worms, but Sentinel and Advantage Multi come the closest. I personally use Sentinel (oral) because I prefer oral meds to topicals since I want to feel free to love all over my doggie's fur. Otherwise, if you take your doggies in to the vet every 6 mos., then they should have fecals done and any parasites found can be treated.

The Pet Education website (out of Drs. Foster & Smith) is a really good site for this kind of information. Here is the heartworm page: http://www.peteducation.com/article....&articleid=743

To summarize....
Interceptor
Oral monthly heartworm med that "controls hookworms, roundworms, and whipworms".
Sentinel
Oral monthly heartworm med that "controls hookworms, roundworms, and whipworms and prevents flea eggs from developing". By sterilizing the fleas, it also tends to reduce the chance that your dog will be infected with tapeworms.
Advantage Multi
Topical monthly heartworm med that "kills adult fleas, and treats infestations of ear mites, roundworms, hookworms, whipworms, sarcoptic mange, and demodectic mange". By killing fleas, it also tends to greatly reduce the chance that your dog will be infected with tapeworms.

*None of these meds repel or kill ticks.

Hopefully this makes sense. Let me know if you have more questions.