Cause for Effect is just amazing!!! Check them out in
http://listen.to/cfe
Another great band that I recommend is Sieges Even... Great musicianship, clean vocals... Great stuff!!! Their first album sounds very very very similar to watchtower, and maybe too similar... Seems that they wanted to copy Watchtower, but in the other albums they are amazing! I personally like the Sophisticated and Uneven albums. Check them out! -
www.siegeseven.com
Another great band is Foe. Unfortunately I don´t have much information about them, I only know that they are from UK. Great instrumental band, not as insane as Spastic Ink, but great anyways.
I would recommend also Psycroptic - great 'not so tech'/death band, with not so bad vocals... Similar to Torture Squad from Brazil.
I also like Zero Hour, great band!
There is a lot of bands that I really love the instrumental part of the band, but hate the vocals - Theory In Practice is one of them - amazing instrumentals, but the vocals sucks.... The same occurs with Alarum (in my opinion) - I like the instruments, but don´t like the vocals, and the list goes on... I don´t know if I´m the only one, but you guys also hate that gutural strange vocals??? In some cases I thinks that these kind of vocals fit very well, like Death, Martyr, but there are few bands...
Talking about death/jazz, the first band that comes to my mind is Atheist, but I´m almost sure that everyone already listened to them... If not, check out! IMO they´re the best in death/jazz, although I don´t know so much death/jazz bands... There is more death/jazz bands??