Now that LR is out, there are DOA1 themes to choose from as well. At the moment, I'm going with:
Jann Lee's DOA1 PS1 theme, Heated Heartbeat. That or Vigaku.
Gen Fu's DOA1 PS1 theme, Fastbreak, OR, Fallen Leaves (which seems to be a popular choice for Akira along with Graceful Sounds).
True Beauty. It just seems to match her general "cool girl" personality. I would use it for Tina if I didn't think Tina's DOA3 and DOA1 themes suited her more.
Going with Leifang's DOA1 Arcade theme.
The Fist of TAIKYOKU Blows up. Previously I used Secret of Kung Fu.
The DOA1 themes sound more like classic VF themes, since both games were made on the Sega Model 2 arcade board. Jann Lee's Lonely Warrior theme sounds a LOT like Sarah's VF2 theme.