Between the 20's. On the aisle, side closest to the 50. Rows 30-39 in the lower level, and rows 43-49 in the upper section. East side if it's cold but not raining, West side if it's warm or raining. If I can't find these I'll take anything else, but if these are an option I'm in.
Logic:
Aisle side closest to the 50: You'll have fewer interruptions with viewing when people in the aisle.
Row choices: I like the views from this level but I don't like being near on the rail from below or having the rail obstruct the view from above.
East/West side choices: East side is in the sun so that's good on cold days and not so good on hot days. Wind is out of the west so rain will most likely be in the faces of those on the east side.