We have always used VPI with our dogs. We have had is for at least 10 yrs. I do like the company, but to be honest I haven't looked at others. But we may switch. We had great coverage early on with them, but lately they seem to pay less and their plans have gotten complicated.
One thing I can tell you that may help with the hip problems is diet. Our lab is almost 7 yrs. old and he was diagnosed with hip dysplasia at about 8 months. We have fed him the Science Diet (I believe is the brand) J/D dog food and it is amazing how it has helped him. He will still have the hip dysplasia, but his doctors are amazed at his high activity level and he has never demonstrated any type of pain or problems. It is pricier than other dog foods. But, we have not had to put him on medication or any surgeries. I HIGHLY recommend this food. It is a prescription diet so you can't just go into any pet store and buy it. We get ours at our vet. I think you can get it at PetSmart, but they will require a prescription card from the Vet and honestly, I am pretty sure my vet is cheaper.