I'm seriously thinking SotN Maria is the best option right now. I guess Shanoa could work too, if I say her existing transformation powers backfired and overtook her or something. If I used Charlotte again I'd have to come up with another plot contrivance to separate her from Jonathan, and that's getting old. Angela could produce some interesting results, but (like Charlotte) I can't fathom why she'd be wandering around the castle, much less end up bitten or scratched by another werecat, without Trevor immediately beside her at all times.
What do you think, CVD?