Ohio State and Tennessee are my picks...if I had to pick one, it'd be the Vols.
Tennessee has as much talent as most top 5 teams in the country, they are just wildly inconsistent. They have wins against Stanford/Notre Dame/South Carolina. Clearly, they are capable of putting together a solid game and upsetting a higher ranked team. They could also just as easily lose in the first round of the tournament.
Ohio State gets my 2nd vote because they have a really really good guard in Mitchell and a strong post in Mavunga. If Mitchell goes off, she's incredibly hard to stop since she is lightning quick with incredible range. Mavunga is a smooth athletic forward who is capable of putting up big numbers. If Mississippi State sneaks into a #1 seed and OSU is their 4 seed, I'd put money on OSU over Mississippi State.