Thanks for both of your replies. I have considered joining another lab, but I'm staying for several reasons. Most importantly, I feel like my lab/mentor are a perfect fit for my personality and interests. My project is seriously that cool. I never thought I could be this passionate about my research. There are other mitigating factors as well. One, I'll be using human blood samples for my research. I don't have to worry about mice or cell-lines (some long-term delays associated with re-establishing knock-out colonies will be an issue for others in the lab). Luckily, the human research involves no controversial treatments (which could cause some IRB problems) or long-term follow-up. Overall, I can't see myself getting sidetracked by more than three months, and this is a trade-off I'm willing to make.