Need Personalized IVR

We need IVR system hosted on cloud with custom IVR options based on the Called ID. Below is the basic flow: 1. Customer calls to our Customer Care 2. Our Cloud Hosted IVR will receive the inbound call and start to play a Greeting Message 3. In the mean time while playing the Greeting message, the system will fetch the Caller Details from our CRM based on Caller ID. 4. The caller will be presented the IVR options based on his CRM details. What we need: 1. The cheap and best Cloud IVR hosting. We are based in India 2. The Custom IVR design code to fulfil our personilized IVR requirement. 3. There should be provision to modify the IVR design code 4. The pricing plan should be - Pay per call. 5. Our monthly inbound calls will be approx 250 call per month