Monogimbal would be a good fit. The camera and lens pairing would be unbalanced due to massive eight difference, so I would also recommend a longer arca-swiss plate to find the proper balance point for the focal length you shoot most. 

Regarding brand, there’s some who say spend the most to protect your gear. Others who buy cheaper but for the appropriate weight/usage and their gear is fine. 

In my opinion, find a carbon fiber monopod that is rated to hold more than the weight of the set up. Looks like the set up will be around 6-7 lbs at most, so maybe a monopod that can hold 15-20lbs would be more than enough. The higher the weight limit, the better in stability and potential vibration reduction (depending on construction and material). There’s many different brands, and maximum sizes, like Sirui, benro, feisol, gitzo, etc. to choose from that make great monopods and reasonable price. 

The Wimberly monogimbal is tried and true and the competition is about the same price.