Three options, help me choose?

[jesbevo]

Hey guys, thanks for the help. Here's the deal: I have one solid letter that I know I'm using. This is from my mentor who I've been doing my undergrad research with. Now I have three other options for letters, and I need to pick the two I want to use. 

1. My first option is with a professor I worked with for about a year. He is VERY big in his field, and the project I was working on was actually affiliated with my top choice school. The problem here is that he's a very busy guy, and I'm almost positive he won't remember me (he's the type who basically contacts the world 100% through his assistant haha--she and I are great friends).

2. A tenured professor in my department. I took a class with him and got an A. We aren't super close but he knows me well enough. 

3. A non-research professor (lecture only) with whom I've done two semesters of internships with assisting in teaching the lab component of the intro bio course. She knows me very well, but because she's not doing research I'm not sure how well her letter will apply to my application. 

Thanks for your input!

[sjoh197]

How much did you actually communicate in person with option one? Despite being big in his field and such, can he write you a strong letter? I wouldn't worry about how busy you perceive him as being, because he is indeed likely very busy. But lor's are part of the job description of being a professor lol. Perhaps you should just ask if he remembers your work and could write you a good letter. 

I'm not really sure about the other two. I believe in rank only, the tenured professor would hold more weight... but the instructor knows you much better. I never had to make that sort of decision. Sorry. 

[MonstersU-Terp]

OptionS 1 and 3. Option 2 won't have much to say other than "she did well in my class."