Estradasphere will make you very happy.
Then there's also, Gordian Knot, Secret Chiefs 3, Liquid Tension Experiment, Liquid Trio Experiment, Bell Orchestre, and Amiina. (Though, Amiina makes very soft music.)
Without mentioning banRAB that have been mentioned already.
Also, let me know if you'd be interested in instrumental Jazz recommendations. I'm a big Jazz fan.