Okay last batch of recommendations!
vogue "HAL's MIX 2000" - This is like, one of the fans' least favorite ayu remixes.... but i'm not gonna lie, it was a huge contributor to my fandom. Talk about your trip-hoppy atmospheric dark tracks. Vocoder effect on ayu's voice, HAL whooshes, exotic and mysterious sound effects, totally epic. I freaking love this remix, and I will never NOT freaking love this remix.
vogue "Kirari Natsu Ayu Mix" which you already know.
Voyage "83key's Eternal Remix" - This remix uses a different, sadder chord progression than the "Canon" progression of the original song, and brings out aspects of the melody I'd never noticed before. It's a strings-based arrangement with a slow, rolling rhythm and some underwater-type effects on some vocal samples.
walking proud (CALM's Balearic Remix Radio Edit) (aka walking proud x CALM) - Very solid electro rework of walking proud with a cyclic, flowing sort of beat and a really pretty atmosphere.
WHATEVER "FPM's WINTER BOSSA" - I mean really it's... what if Fantastic Plastic Machine produced "WHATEVER," haha... bossa/latin jazz-inspired dance remix, lots of maracas and new background vocal samples.
Who... "Blue Obsession Mix" - samples the piano from the original but gives it new everything else. Very dreamy and lovely. It sounds the way a sad, nostalgic sigh feels.
Will "Wall5 Remix" - Edgier, rockier electronic take on "Will." The vocals are rearranged to fit a 4/4 beat during the verses which were originally 6/8, but it doesn't sound awkward or wrong thanks to the slight distortion filter and the echo and glitch effects placed on them. The drum track has a slight drum & bass vibe in that it's very complex and quick. The instrumental break has some experimentation with polyrhythms too... Very bold, dynamic sort of remix.
Wishing "taku's CHEMISTRY REMIX" - Slow R&B version of the song with acoustic guitar all through it, remixed by Taku Takahashi of m-flo (who produced Merry-go-round and MY WAY)... Taku was much more conventional R&B/hip-hop back in '99 though, and this is a very pretty, simple, unassuming version of Wishing.
YOU "MASTERS OF FUNK R&B REMIX" - Well... it's an R&B Remix of "YOU" lol. Utilizes a ton of 90s R&B tropes to get the sound, really nails it. I don't think it's anything special, having grown up hearing a TON of 90s R&B on the radio & on MTV all the time, but it's solidly produced to be sure.
Well..... that oughta do it! XD