OK, I'll name a japanese car

Infiniti G35 Coupe.

The thing is, Japanese companies just do not make many fun and exciting cars in the 40k price range. There are cheaper cars that are "boy racer" types. Or if you go above 60k, you can get a Lexus SC430.

From what I read, I think a mid-luxury car with a bit of sportiness is right for you. Since you already have a Sienna, for this car you can sacrifice a little practicality for the extra fun factor. Since you are a lady, you'll want cars with a clean, timeless styling. The Audi/MB/BMW models are the best examples. But if you insist on Japanese cars, the Infiniti is quite good, the only thing it's lacking is special flair.