Broadcasting via twich

I´m thinking about starting a broadcast with twich. What program is good for this (Open Broadcaster Software, XSplit, Gameshow, ...)?
Do you have some other advices for me?

OBS Studio (the one on the right)

I use OBS Multiplatform; its other version of Open Broadcaster Software, you can find it in the same page... For chat I use Chatty.
I also use TwitchAlerts, its a site (for announce followers and chat in the stream, and donations (nobody donate to me but its possible :) )

I just have 1 Mega of upload. So I use a bitrate of 400

OBS Multiplatform is replace now by OBS Studio...
I use the last version of OBS Multiplatform 0.12.3

I have another advice.
I stream for a while with music and sound from the chess pieces (everything works OK) but remember that twitch can mute our videos due to copyright (not while you stream live but if you record them in twitch)
Then I star to want to speak… So I buy a headset (hyper cloud x 2) and had a lot of problems, first sound it’s to low, then to high that listen my breathing… So my advice is to buy a Mic instead of a headset. (but this could be just my problem with headset)
I never stream with webcam because my upload is just 1 MB.
You can see my here.. To see the quality of my image with a bitrate of 400.
http://www.twitch.tv/scalachess/profile/highlights

With correct settings you can stream your webcam with 1 MB upload and a bitrate of about 650 using, resizing the quality to 720p.

My internet provider said that I have 1 MB but in reality I have around 700 Kb in speedtest.net... maybe its enough to webcam I dont know, for now I prefer to have a good stream without webcam :)