Masters

Hi Mani,
Though both these colleges are good I will strongly go for the one with co-op option. Being an international student, it's very important that you gain some experience while studying, this will increase your job prospects there and you can also show some international learning experience on your resume. Co-op is an essential factor in the learning environment so Conestoga I will suggest. But, confirm with them, inquire about the companies they have opportunities with, what kind of co-op learning will they provide, etc.

Yes, you will be deemed eligible to do Ph.D after completing Master's degree from IGNOU.

Following are the best:
University of Sheffield, University of Glasgow, The Australian National University, University of Liverpool, University of Dundee, Murdoch University.