I like Row 6 a lot on the 738. Half-curtain divider with under seat storage and lots of leg room. For me, it's the best mainline coach seat of any US domestic (for those that know me from other forums, my favorite coach seat in the sky is the US Airways Express E75 bulkhead - same deal as AS, but a generally newer plane, wider seat and no middle).

My MVP status is expiring on 12/31 but I just booked two early 2015 trips now so that I could still reserve Row 6. It's excellent if you have kids as well - there's some room to let them roam without entering the aisle, and it's also really hard to bother the people in the F seats in front.