Where I sat depends on how sleepy I was...
If I had my thermos of coffee with me, or was in danger of falling asleep, at the back. Otherwise, kind of near the middle- but I have fairly bad eyesight, so can't read the oht's from the back properly.
I'm fairly laid back- I will adjust my work around my social life until it all builds up- but I am concientious! I do worry a lot if I'm not working.