I was initiated into Transcendental Meditation about 4 years ago, but there was no TM center in my area, and I really needed guidance, so I found a local Kriya Yoga community, and got involved in it and eventuality stopped TM and was initiated in Kriya Yoga. I did that for about 3 years, but then I applied and was accepted to Maharishi University of Management, and they "require" you to do TM exclusively, but I've been kinda of doing both. TM is mantra based, but the primary technique for Kriya is a pranayama breathing exercise, which is sort of similar to kundalini yoga. It sounds convoluted but they actually work well together. But I still feel Kriya is my path. I've heard of Krishnamurti, but I never studied him. Have you ever read Being Still by Jean Yves Leloup? It's about Orthodox Christian meditation and metaphysics, it's really cool. The Orthodox tradition seems to be much more grounded in mysticism.