I am interested to start trading with binary options. There is a chance make some big winnings in a short time. I have been reading about the matter in a good website called 7binary options and learned a lot.
I just have to decide a brokers, so my question to the users of the forum is to suggest a couple of reliable brokers to me, pls.
I'm going to reject the premise of your question.
Binary options are thinly-veiled gambling. They're the equivalent of going down to the Sands and putting it all on black.
You don't ever need a binary options broker, because you shouldn't ever need to trade them.
(For that matter, I don't think there is such a thing as a reliable binary options broker. These things have been regulated out of existence in every reputable jurisdiction, so the only brokers offering binaries will be crappy-ass bucket-shops based in Cyprus or Malta or Mauritius or Panama - all of which should make you run a mile.
Of the five brokers on that dodgy page you pointed us to: one won't even let me access their website; three are based in Cyprus; on is Seychellois, which is a new one on me; and one is a shell company run out of the British Virgin Islands, which is dodgy even by the standards of FX bucketshops. None of them will give you any protection if the broker decides to take your money on an extended vacation to somewhere with no extradition treaties.)
Edit: so I should have clarified "to retail" in the above. There's an active, liquid market for FX one-touches and digitals interbank, and if you're a BSD client you can trade them across relatively tight spreads. But there's no way retail should be trading these things.