My take always has been to stay away from US when it comes to frontline defence articles like, combat jets, Radar systems, C4I, and comms. Areas where India can immensely benefit from is in infrastructure projects, Consumer goods, Energy, transport logistics and mutual defence projects such as Infantry Combat systems -small arms protective gear, Transport platforms, engines and hydraulic powerpacks, Specialized Machine tools etc.
US can open up a large market for India, to offset it's current requirements that are being met in China, in return if India has to provide limited co-op with US, it won't be a bad deal. With China next door arming Pakistan to the teeth, it is imperative that India maintains a good balance with major powers around the word to meet it's defensive requirements and protection of it's strategic interests. ,
After scorpene leaks, I am very very suspicious about Russian weapons. I think they can share the specifications with Chinese for money.