Actually, 6A is a good seat, its the exit row, slightly more legroom. The legroom isn't that bad on a Saab, I've been on 737's that have been more cramped.
Any A except 1A, 2A, or 11A are the best seats in the house. The A is the single side, get a window & an aisle.
1A is bad because its the first row at the door, you'll be getting rather friendly with the F/A on takeoff & landing as the jumpseat is directly facing you...(you never know you may like that kind of thing) Actually, this is usually the last seat to be filled, only used if the a/c is 100% full.
2A is no good since there is no window
11A is bad since it is the last row on the aircraft and there are four seats across the back.
My best pick is 3A