how easy it will be to get in depends quite heavily on where it is that you want to go. i think that you will find more top class universities (that are very competitive to get into) in the US, but i think that you will also find more low class universities (that you probably don't really want to go to) in the US. both extremes, really.

with PhD applications in the US each application costs you US$80 a pop. that makes it harder to send out applications to a larage variety of places. you probably would be best to submit a couple of ivy league applications, a couple of applications to programs slightly lower down, a couple of applications to programs slightly lower down again etc. then (ideally) you get some choice in where you end up.

they reccommend sending out about 5 or 6 applications (at a minimum).

I've heard of some people from India who apply to do medicine in the US applying to around 200 places. they simply HAVE to be a doctor, i guess...

applications can be time consuming. you are at a significant advantage if you are able to fund your studies yourself and you don't require a scholarship. given that (and working with the assumption that you will score well in the GRE and that you will get good grades in your next couple years) i'd say that it would be worth applying to a few ivy league institutions. don't know whether you would be thinking of going on to do a PhD but it would be much easier to get into an ivy league PhD program if you have a Masters degree from an ivy league instutition.

i'm not sure whether it costs to apply to Canada...

it doesn't cost to apply to Australasia.

i'm probably not the best person to ask about computer science jobs in Australasia. i'm in philosophy myself. getting an academic job in philosophy can be a bit tricky. less than half the people who complete their PhD get an academic job (world wide), though your prospects are a bit better if you go to a well ranked institution.

there are more post-doctoral fellowships available per academic head of population in Australia than available anywhere else in the world. i'm hoping to stay in Australia and pick up one or two of those.

so long as your English is alright (it seems to be) your indian citizenship certainly wouldn't be held against you in Australia. you might even be able to pick up residency and then dual citizenship along the way if you wanted a job with defence or something like that.

will you have to take the TOFL or whatever it is called (English language test) or was English your language of instruction (I've heard that often native English speakers can struggle with the TOFL test)?

the reluctance to hire people with Australian degrees might be a reluctance more generally to hire people with degrees under the British system.

US system:
first (undergraduate degree) - four years.
masters degree - one year? two? i'm not sure on this. worth looking into...
PhD - 5 years. 2 years coursework. breadth exam to show general knowledge in the field. depth exam to show specific knowledge of the area you wish to write a thesis on. 3 years thesis.

British system:
first (undergraduate degree) - three years.
honours (required if you want to proceed to either PhD or Masters) - one year coursework.
Masters - one year research
PhD - 3 years thesis.

(this is the new British system. It has been modified slightly from the old British system so it is more comperable to the American system).

the main things to note are the 3 year first degree compared to the 4 year first degree. if i was choosing between two comperable applicants then i'd choose the person with 4 years training over the person with 3 years training to be sure. if someone has a three year first degree plus a year of honours study then that is supposed to be equivalent, however.

the other main thing to note is the 3 year PhD program compared to the 5 year PhD program. that is a biggie. people are forced to specialise early under the british system and thus often lack some of the breadth and general subject knowledge of people coming through the 5 year program. that does make it hard for Australasian students to compete with American students for jobs. The US job market is a biggie because of the sheer number of institutions that they have... That being said... I'd rather have a tenured position at the University of Melbourne than a tenured position at the University of Arkansus (no offence peoples). Getting a position at the University of Melbourne would of course be hard to do and one would have to face competition from people from the US in order to get the job. On the upside... They do seem to like to take applicants who have ties to Australia (which you might well develop after being here for a year or 4 if you stay for a PhD) and if you know the people (as you will get to do if you go to conferences and the like) then that will count in your favour.

But that is all academic posts... And I'm not sure that you want an academic post...

I'd say your first step would be to get a hold of some university rankings for your area of study...