Her voice was very solid during CDL 2000-2001 IMO. I'd recommend SEASONS perf the most, she sounded almost like in studio version, what doesn't happen often to her.
I know people are gonna say: HANABI @ a-nation '05, so... go for it too!
Also:
- any A Song for xx performance during A BEST promotion
- haru yo koi
- Memorial address at MUSIC STATION (A BEST 2 era) - I was impressed, she did great!
- HAPPY ENDING @ Arena Tour 2005
- rainy day @ Arena Tour 2006