Jeff and Britta are intriguing, i just think they're both too egocentric to be in a relationship with each other. Annie makes the most sense for Jeff despite her youth. I think she sees the "good" in Jeff and thinks she can coax it out.
I think the same could be said about Britta seeing the good in Jeff, but she is far more aggressive and tries to force it out.
Though, I'm also interested in a Troy and Britta coupling, I thought we might have seen it while Annie was still interested given the possibilities for stirring up the group dynamic with not only her but with Jeff as well. Plus I'm a bit disappointed at how underused Troy is, or at least have Troy being more than Abed's shadow/the "crab dip" guy.