Are you in C? Or "OC?" OC is, indeed, because they fill in the orchestra pit with 3 extra rows. Subscribers aren't in those rows, so availability can be open. It is quite close, but many people love it. It's a large venue, where tiers 1 and 2 (mezz and balcony) are quite far back (overhang begins at orchestra row W), so I recommend sitting in orchestra if there are seats closer than row W. If row W or further back, go for Grand Tier. 2nd tier is... not my favorite. But definitely great prices.
If you realize you are in OC and want to change, give the box office a call. They are quite accommodating. Looks like Thur eve has some great orch seats currently.