I did my Master's in Archaeological Science at the University of Cambridge in archaeogenetics. They have several really interesting ongoing projects that use molecular biology/genetics to investigate prehistory and an entire archaeogenetic lab. You might want to check them out if you'd be interested in going to school over there.
Also, I'm currently looking into PhD programs, and I am finding that more people in Ecology and Evolution Departments are working on projects that combine genetics and archaeology than in Archaeology Departments, so you may want to consider looks at those types of programs too.
