Dr Miller is the BEST and fortunately for you, socalirocker, she's right there near you! She's really nice, calm and very very good at explaining things so that you will know what is going on.
Your cat needs to see the cardiologist SOON, you need to know what is causing the heart murmur to know how best to manage your cat's condition. Even with dire conditions, with careful medication and monitoring cats can live good lives for some years.
My Bobo (F2) had a very grim prognosis...Dr Miller was the resident at UC Davis when I took him up there years ago, they wouldn't put a time on it but they only gave him 6 months to live... I could tell that was what they were hedging around but Dr Miller kept saying that they believed in miracles. And Bobo WAS that miracle. He lived another TEN YEARS on top of that six months... but died this year of lymphoma. Still, we had those ten years and he had a great ten years that I will always be grateful for.
It IS expensive to do the ultrasounds and testing and medications...but the reward of having your pet be healthy and happy for longer is worth it to me.
I've taken some of my cats down to LA (I'm in San Francisco) just so that Dr Miller was the one that did their heart checks before breeding... she has seen a lot of Bengals and Savannahs in her time and I trust her judgement. Good luck!