As long as you have a good reason for moving on, I wouldn't worry about it.
Some times things just don't work out. Sometimes it's the employer, sometimes the employee. Employers understand that, but they will want to know that it was your choice to leave, and what made you want to leave.
Though the pay is one thing, if somebody asks you about this in the future, it is better to focus on the work not being what was promised, and not being fulfilling, or whatever the issue was.
On a side-note, if this shortish stint (I've had shorter), comes up in an interview, try to tell the interviewer what you liked about the company as well as what you don't. I remember interviewing a guy that did nothing but complain about a former employer. He didn't get the job specifically because I didn't want to bring in somebody who had so much negativity. Byt he sounds of things, you've got a good head on your shoulders, and a couple of offers already, I'm sure you'll be fine.