Also you can check out Kaya Project ( though I have a feeling that you already know them as well.)
http://www.psyshop.com/shop/CDs/itc/itc1cd035.html
If not, it’s not exactly psychill/psybient, it’s more of an electro-acoustic fusion.
Also not psychill/psybient is karsh kale. ( you will hear lots of real instruments there , vocals too, very organic )
http://www.youtube.com/watch?v=qgfUVT9netg
And also Bombay Dub Orchestra
http://www.youtube.com/watch?v=ykUU61ZOXwQ
http://www.youtube.com/watch?v=SlhnyLkMEaA
Again not psychill/psybient, but beautiful stuff.
let me know if you alraedy know these artists or not, and if not, tell me what you think.
Cheers !
