Sales & Marketing

All the specializations which you have asked are very good. Every specialization is having good demand in the market, based their profile it varies.
Finance is one of the great field, present number of companies are recruiting finance candidates with good package.
Marketing is one of the key branch in the company without marketing no company is there.
The need of HR candidates is growing day to day because number of employees are changing their organisations so companies have to hire new employee in the place of them.
So you can go for any as per your interest area but purse your MBA from a reputed bschool only. I can suggest you some good MBA colleges which have good infrastructure, exposure, faculty support and placement cells.
1. IIMs
2. Tata institute, Mumbai
3. xavier institute of mangement, Bhubaneswar
4. S.P Jain Institute of Management & Research, Mumbai
5. UPES, Dehradun
6. ICFAI university, mumbai

Since, cloud services have a huge potential, the demand for professionals will be equally high in the coming years. Moreover, since India does not a have ready talent pool, they might command a premium," says Nitin Khanapurkar, executive director (advisory) KPMG, who works in the domain of cloud computing.
According to a study by global IT consulting firm Zinnov, the global cloud computing market is expected to be over $70 billion by 2015, and India will create job opportunities for about 3 lakh people in the same period.
Salary levels will be equally impressive. An entry-level professional, perhaps with 5-6 years of experience, can earn around 12-19 lakh, while a mid-level executive will get around 20 lakh. People with 10-15 years of experience can hope to get 30 lakh or more.
For those who want to upgrade their skills, the options are, however, limited. For their staff, IT companies themselves are providing training and there are some certificate courses offered by Aptech and NIIT, among others. Job seekers and students, who want to enter the exciting world of cloud computing, might have to wait a while before choices for study open up.

If you are not keen interested in computer languages, I don't recommend B.Tech in CSE or IT because in today's world there is a huge crowd of students in CSE and in near future there will be very tough competition in IT field. So, think twice before taking CSE or IT.
You can keep these points in mind:
1. In most of the colleges first of all CSE seats are filled.
2. Most of the girls do engineering only in CSE, IT or ECE.
3. Intermediate commerce students has the option to do BCA, which makes IT filled more competitive.
4. Almost each students wants to become computer engineer to get high package.
From all these points, we can conclude that how much crowded is IT field.