which seat in PE ~ LHR to IAD

Hi
I am flying to Washington in June in PE. I am not sure what seat to go for. I am flying on my own. At the mo I have 19D, I figured that I would stand more chance of getting a couple next to me and that way I wouldn't have to get up to let people out, or should I go for a C seat and then hope no one sits next to me (not very good at these decisions as I have never flown on my own so always chose A and C for me and my husband) ?|
Any help/views would be good.
Thanks
I am flying to Washington in June in PE. I am not sure what seat to go for. I am flying on my own. At the mo I have 19D, I figured that I would stand more chance of getting a couple next to me and that way I wouldn't have to get up to let people out, or should I go for a C seat and then hope no one sits next to me (not very good at these decisions as I have never flown on my own so always chose A and C for me and my husband) ?|
Any help/views would be good.
Thanks