I feel that this question is bit off the track. Recommending a good consultancy does not mean that you will get sponsered for H1B. You have to land in a job in a company that sponcers your H1B.

However, these days many people are getting H1B sponcered by Indian consultancies without a project (i.e without payroll). In such people just hang in there until they get a project. Once one gets a project and gets into a payroll he/she will have opportunity to explore other company and transfer the H1B for better job. But if a person did not get a project then he/she is stuck there. There is no way out.