Not totally based on reputation but based on my area of interest as well. I am working on blood stem cells and leukemia from past 3 years so really want to continue doing that. Harvard, Stanford and Columbia has labs which works on blood stem cells and pre-leukemic conditions and interested in 2 labs at Yale working on leukemia.
About the LOR, I am getting 2 really strong ones from my current PI from CSHL and previous one from MSKCC. Third one from current director and I assume it'll be a good one. I'll get me GRE score (quant and verbal) on October 20th.
Thanks for your suggestion, will work hard on SOP.
I am also considering Watson school of biological sciences at Cold Spring Harbor Lab.