before I answer this Q I'll answer the Q you sent in the email:
yes, yes I have
Zigoku Quartet
http://www.youtube.com/watch?v=QtN7vWQ81XE
Gonin-Ish
http://www.youtube.com/watch?v=fRrXUZ8AxiE&feature=related
Gargoyle
http://www.youtube.com/watch?v=dTJlnOdcDQY&feature=related
MQ (assuming Avant-Garde is grouped in with this):
1 - Adagio - Archangels in Black
http://www.youtube.com/watch?v=z9u9Rvq-ojs
2 - Scenes From Hell - Sigh (also to be listed above)
http://www.youtube.com/watch?v=i8SPdERJiN8
3 - Incurable Tragedy - Into Eternity
http://www.youtube.com/watch?v=w6shbMTB9Lk
4 - Unexpect - In A Flesh Aquarium
http://www.youtube.com/watch?v=RMSzH0CuXtk
5 - Quo Vadis - Defiant Imagination
http://www.youtube.com/watch?v=W5ciJcksiEU
6 - MyndSnare - Conditioned: Human
http://www.youtube.com/watch?v=GhGVcVkeDXw
7 - Hevein - Sound Over Matter
http://www.youtube.com/watch?v=YTrvEhYzfEE
8 - 旋律の地獄遊戯 - Zigoku Quartet
http://www.youtube.com/watch?v=omalOQ3uUAA&feature=related
9 - Triosphere - Onwards
http://www.youtube.com/watch?v=Z_PiH8whx2g
10 - Trigger the Bloodshed - Degenerate
http://www.youtube.com/watch?v=mLuZpuW9GfM
MQ2:
1 - Adagio
They have insanely epic symphonic elements, and one hell of a vocalist... how could I not like them?
2 - Into Eternity
They're a bit of a combo between progressive, technical, and melodic death, with (IMO) the best singer in metal, and each of the musicians are incredibly talented.
3 - Sigh
Japanese Avant-Garde metal (done right) combined with symphonic black metal, with one of the vocalists being a hot Japanese chick. Everything is pretty much perfect about them.
4 - Unexpect
Another Avant-Garde band done right. like I say below, they have the whole 'circus from hell' thing going on.
5 - Quo Vadis
all the band members are beasts at their instruments, including the vocalist. they can put together Tech death that is not the least bit boring.
BQ - it honestly depends on the band. both genres can be really awesome, or INCREDIBLY boring IMO (such as Necrophagist, Brain Drill, Dream Theater, Opeth, ect.) that's right I think those bands are for the most part are boring. anyone who doesn't like it, can write me an angry letter and shove it up their... well you get the point.
I like a good avant-garde band too, but a lot of them sound like a jumbled mess. It's hard to find a band that can pull it off, and when there is one, they sound like a circus from hell (awesome)
BQ2 - Scenes From Hell - Sigh... and if avant-garde isn't supposed to be counted in this, 旋律の地獄遊戯 - Zigoku Quartet
BQ3 - nah, Trog Metal sounds great