I don't think there's a pit at the Bass, unless they can remove the first three rows of seats. They just did a huge renovation (which is barely finished) and they didn't sell any GA tickets. If there was a pit, would it be fcfs? Sounds like a logistical nightmare (everybody line up to attempt a stage-jump-handshake-mozhugg maneuver).
I do remember a Duran Duran show one year where they opened up the front as a pit, but that was before the renovation.
As far as I know, any seats in Orchestra are going to be pretty good, although the double-letter rows are below the balcony. The "obstructed view" seats (very few) are marked on the online seating chart:
http://www.utpac.org/visit/seating_maps
...and are behind the wheelchair-accessible boxes, etc. Otherwise the view is pretty open. It's all in front of the stage (no side-view seats or anything).
I remember having seats once all the way on the edge of a row, and it was still a damn good show.