Are you on your own or with someone?
If on your own 7A is my seat of choice (K is fine but I am a sucker for LHS). The table that jits out from the bulkhead gives this seat a very enclosed feel.
If with a partner then 3/4AK. The width is just enough to not make you feel too far away but not so close that your ottomans are about touching as with 1.
I will miss this old bird. By far my favorite aircraft in the skies, it holds a sence of wonder..............