Internship Advice - Completed sophmore year at a top undergrad

I just completed my sophomore year at a top undergraduate business school, and have been searching for summer job experience for a while. I am facing a dilemma at the moment, and was wondering if anyone had advice.

I was able to find a PWM internship with Smith Barney, but it requires a commitment until December. On the other hand, I had been looking into a boutique technology investment bank for a Fall internship. However, that position is not guaranteed, but it obviously would be more relevant for SA recruiting. If I commit to Smith Barney, it would be difficult to juggle another internship and classwork.

What advice can you give me? Ideally I would work at Smith Barney over the summer, and work at the boutique over the Fall while rushing for the DSP fraternity on campus. I have had internship experience in a pharmaceutical start-up and in a technology firm in Asia, but would like to express interest in Finance.