I don't go very far with a Sinar! I have a Manfrotto 058 tripod with a Manfrotto 229 pan & tilt head which suits the Sinar quite well, I also have a Manfrotto 168 heavy-duty ball head which will hold the camera fine but has the operating problems of any b+s head with a heavy camera. At home I have a thing called a De Vere industrial stand, basically a very old heavy-duty double-extension tripod with a very large (1 3/4") center column which unlike most tripods is very stable with the center column in any position. This has a Manfrotto 068 b+s head in it, I use it as a studio stand for any camera because the center column raises and lowers quickly. I have a Manfrotto 055 tripod too, I use this outside with the 168 head and a Mamiya RB67 or Speed Graphic, it's definitely a weight/stability trade-off and the center column is more or less purely ornamental!
Regards,
David