There are tons of Indian consulting companies in the Bay Area. Check sulekha.com.

There is no such thing as Best Training. It all depends on you. If you do BA or QA training, it is about 1 month training and then you are in market.

BA job depends on company to company. Each company defines BA in their own way. For example one company may be big in Use Cases and process flows diagrams, another one may require BAs to capture BRD/FRD only ... bottom line is BA job is different from company to company and difficult to train. You have to have good communication skills and quick learning ability. Also one bad thing about BA job is after you are done gathering Requirements in Phase 1 or 2 depending which SDLC method the company is following, the company will let you go since there is no need for them to keep you. It is very difficult to find a BA job and stay on that job for over 6 months. Normally I have seen BA's looking for another project after 6-9 months or so. If you can impress your Boss then you might stay longer.

QA job is very technnical. Manual testing is not very hard. If you go for Automation testing, you need to understand some programming. For QA, you need to be able to write test cases and test plan. Some companies might require you to write Test Strategy. One also needs tool knowledge. If you go for manual testing you will proably need to learn Test Director/Quality Center. If you go for automation then you will need to know either Winrunner, Silktest or QTP. I have seen QAs last longer in a project than a BA. Also you will need some experience with writing SQL queries and UNIX.

One thing to remember is after you are done with training, it will be a challenge to get a job since you have never done it before and the other difficult part is surviving on the job. If you cannot perform like your resumes says, there is good chance you will be booted out.

My suggestion for sampada is, make 100% sure that the consulting company you are joining has direct connection with companies. This means that after you get trained, the consulting company will place you on a project with their client directly, hopefully without an interview.... :)

Most consulting companies lie and say they have direct connections or they are partners with big companies etc. Please do your homework before you blindly believe them. In fact what they do is go through mid clients and they put your resume on Dice.com. What will end up happening is, after training, the midclient (e.g. Maxonic) will interview you over the phone. After that, Maxonic will setup a face to face interview with the end client. So you need to pass Maxonic phone interview and then pass interview with the end client and then you might get the job. Remember Bay Area is a very competitive place. This is silicon valley where there are plenty of folks who are doing same thing like you.  So you need to be good . ..really good in interviewing and knowing your stuff.... :)

I am not trying to discourage you. Just trying to give you a real picture of the real world of consulting. If you can find a consulting company that will train you, sponsor H1 & GC, pretty decent market comparable pay rate and directly place you with end-client, I say go for it.

Good Luck!