If you change your mind about clear cases.. Spigen Ultra Hybrid. Survived a few drops from my son playing Pokemon Go.. and a few from me. :)
I'm usually a fan of cutout buttons, and this one does not have them, but button pressing is solid on this.
Alright here is my strategy for accessories and getting prep.
As I ordered from Google Fi, I will have a 50% discount on accessories - that could change a bit my strategy (not much on cases, but on the dual Type-C charger)
First of all, I got a few USB micro to USB type-c adaptors
This way, I am covered to charge with my current cables and my 4,000mhA Moto slim battery that is micro USB. Until there is something as big (capacity) and as slim with type-C, I will use the adapter with the battery. I won't care about fast charge, I will just care about getting more juice.
Cases / Sleeves
My SO got her 6S+ recently, so I have been able to have a good feel for the size. She has put a very thin TPU transparent case on it and I think that's the way to go for me too, with a sleeve.
Also, I think I will get
Cables
For now I think with what comes in the box I should survive 2 to 3 weeks before making a decision or wait for new products / new reviews etc... With the 2 news Nexus, the Xiaomi 4c, the announcement of the S7 having Type-C, I think there will be a lot of momentum on the Type-C side over the next 2 months. Better quality, better prices, more products, etc...
Charger
Stand / Dock / Cradle
[Update]
Camera Lens
As the camera is said to be amazing, and as smartphone lenses have become better in quality, I might buy some to check it out - specially interested in the wide angle ones
My 6P just came in today. I ordered this cheap one until my Spigen comes in on the 12th. I am honestly not sold on any of the cases I have seen. I really like the Spigen Thin Fit but I am worried about it not covering the top or bottom.