Not a big fan of Tamaki Nami. I liked a few of the songs by her that were featured in Gundam SEED, but apart from those...... nah. I don't particularly like her voice. It's the kind of voice anyone can have... anyone can sing like her and be a hit. I'm into Lia, Ikimonogakari, Olivia, Mink, Sifow... granted, none of them are as huge or as established as Ayumi but they have much better voices in my opinion. Tsuchiya Anna is not bad too, if you like more "raw" stuff.