Mika Nakashima's greatest hits album,
BEST. Yes, that's all you need. She is really frickin awesome. I recommend Mika because she's a popular artiste like Utada and Ayumi, hence easy to like. 4 out of her 5 albums sold over a million, she's very pretty, she's a Kanebo model, and her songs are addictive jazz-tinged pop music.
Furthermore, she started her career in the new millenium, so she doesn't have any old-sounding songs. Her stuff are modern too. I'm uploading her music for you. She is so good, you won't need another artist ever. But of course, it depends on your taste and the frequency that you listen to her...
Here's her song called "Oborodzukiyo ~Inori" which is deemed by many to be her best. A melancholic song with a traditional feel.
YSI Download Link
Here's "LEGEND", my favourite Mika song, I love it a lot because it sounds so modern, advanced and relaxed.
YSI Download Link
Here's Yuki no Hana, one of Mika's most famous songs. It's a beautiful winter ballad.
YSI Download Link
BEST also had her biggest hit, the #1 single Glamorous Sky. The compilation was released last year and it already sold 1,086,000. It's currently the #5 album of 2006 in Oricon, a spot above Ayu's (miss)understood.
All these songs are on BEST. There's a lot more I'd love to upload but it'd take me very long, even a track requires around 7 minutes to upload. Please do try her. Anyone else who are interested, download too.