I'm pretty lost with modern J-Pop. I listen to mostly 80s and 90s j-pop, and I don't quite like some of the modern j-pop I hear, but some is really awesome. For modern J-Pop groups, I like Move and Perfume. I like some of the 90s singers, ala Ayumi Hamasaki and whatnot, too. Move is pretty much 90s, they've been around 15 years now. Show me some modern j-pop that's good, these are some modern songs I like.
[youtube]http://www.youtube.com/watch?v=PFZVSze1N3U[/youtube]
[youtube]http://www.youtube.com/watch?v=Bxpmn3pQoss[/youtube]
[youtube]http://www.youtube.com/watch?v=mfqrU5ILj20[/youtube]
[youtube]http://www.youtube.com/watch?v=Mh_wTdhmaMI[/youtube]