I prefer the 320 over the 752, but I also prefer 5 hours of sleep over 3 hours of sleep, and for redeyes alone I want F over Y. Is DC your final destination, or are you connecting on from there?

Since you are a 1P, though, I'd seriously look at the loads on the OAK-IAD 319 - not the seat assignments, but what fare classes are still available. If there are still W seats available there's a good chance that getting the row 11 exit aisle with the middle blocked would be a decent way to go.