Hi Irasho, perhps your thoughts on wanting to be a TEFL teacher abroad are a bit far fetched ;)
I'm saying that it might be an idea to check out the other threads and posts in our forums, and the dozens of articles in our archives and on TEFLTASTIC to see what others are saying.
From my point of view as a recruiter, if I'm waiting for someone I had a telephone or video interview with last week to make up their mind, and someone walks into my office this afternoon with the right clothes, the right quals, and the right manner, I'll send him back to his hotel in a taxi to collect his bags and move into our free accommodation tonight and start teaching tomorrow.
I will have saved my school nearly £1,000 in air fares, and the uncertainty of someone who might change their mind again at the last minute, or who might do a runner after receiving their first month's salary.
BTW: You're partly on the right track - but check again, some of the names you mentioned might not simply be recruitment agencies. EF for example has a whole chain of cram school in Southeast Asia. Do take a moment to Google the names of those firms, and of course others, and see what teachers who have worked for them are saying. Remember that mainstream schools advertise on niche TEFL/TESOL websites, and don't forget that very few people take the impulsive initiative to post about their good experience - Internet forums are more often a magnet for those who have an axe to grind :)