You can be evangelical in all positions -- make sure you do a respectable work wherever you are and people will respect you and your opinions. If the job looks better, go for it!
This is time to use your intuition, not to be rational. If you stay rational you will never change jobs because your brain can invent and pretend that your current job is the best and the opposite is the worse.
Man, I'd like to let you to know something: it's not about how fucked up you are, but how you deal with it.
Just to begin, I live in the third world and you live the life I wish I could.
So, you can get a job somewhere else. Do it. Now, let's put some focus on your life: YOU HAVE TO DO SOMETHING.
I have quit my job also but I got my shit straight by doing college and shit, even though I'm from a poor family and all my class had more money and 'happiness' than me.
You know what? Happiness comes from the inside, from the outlook you have of life. If you created this post right here, right now, that can only mean a good thing: you are striving for the best. I've been suicidal for a long time in my life and thats because I was trying, you know. It was hard as hell, but that made me hard, and this is what you become once you go over all those problems, everything will look small.
Congratulations Hampton! You do an awesome job for the open source community with not only sass but all your other projects(like haml). I think this moment is important because it shows that we aren't a community of prejudice but respect.
I get almost 10 minimum wages with 24 and I think that I'm underpaid(and I am...). I was making WAY MORE money working as a freelancer than working for a company here but it seems that people(and the government) only respect who is employed by a company, otherwise I will never be able to buy a car or a house with a loan. Our government sucks.
College on Brazil is alright, the problem is with research culture -- horribly bad. Teachers on universities are rated by how much shit they published instead of the quality of their work.
The academic field is very bad for anybody wanting to study something advanced but at least in computer science, being a undergrad is just fine. You learn the same shit that the MIT does, the problem is 1. the people of your class, 2. your teachers don't do anything interesting to inspire you.
Keep your job and do interviews for companies in the $75-90k range.
It won't look so bad as much as you think if you leave after fiding another job. You negotiated badly and they ripped you off... also, a >50% raise should always be a reason to leave your current company, it doesn't matter if you are there for a week or a decade.
You are the "prize", start acting like it and they will treat you like so.
This is time to use your intuition, not to be rational. If you stay rational you will never change jobs because your brain can invent and pretend that your current job is the best and the opposite is the worse.