Thankfully, there are several manufacturers who make excellent products. When I switched over from the Manfrotto RC2 quick release system to the Arca Swiss style quick release system, I purchased a bunch of things from Kirk Enterprise Solutions. They couldn't have been more helpful. I got my old Giottos tripod with the Manfrotto 468 head to work as well as possible.
I save up for camera gear every year and when it was that time, I ended up purchasing a new tripod and monopod from RRS. I am still amazed at the quality and even more importantly, the ease of use. As others have said, from what I've read Markins also makes excellent gear. I can say the same thing about Kirk, in fact, I had to get my L bracket from Kirk because RRS doesn't make a one piece L bracket for the 60D.
It is nice to have quality choices. We are fortunate.
Kim (the male variety) Canon 1DX2 | 1D IV | 16-35 f/4 IS | 24-105 f/4 IS | 100L IS macro | 70-200mm f/2.8L IS II | 100-400Lii | 50 f/1.8 STM | Canon 1.4X III
RRS tripod and monopod | 580EXII | Cinch 1 & Loop 3 Special Edition | Editing Encouraged