I have a 6D. It is perfect for landscapes. Great sensor, ergonomics, image quality. The centre sensor is all I need, and it's bang on night and day. (I've used Sony apsc/full-frame, and Pentax apsc in past.) All the benefits of the 5D are lost in landscape shooting (and a whole lot of other shooting too, except action shooting).
I prefer the 6D because it's the lightest full-frame DSLR going - easy to use, easy to carry. Perfect grip. I have one extra battery - if you merely want the grip for the batteries and not for vertical hand-held shooting, why a grip for a tripod? Bulk. You should still be able to change batteries even with most tripod plates on the bottom.
I have a Velbon Ultra Lux iL tripod. It fits in a small case and is light. 100 bucks used. I can take 1-minute night shots with no shake with the 6D (70-200/f4 is my biggest lens). But if you want a big heavy tripod to carry around, go for it. Though, if you have a Sigma 50-500 or something, then you'll want to get a sturdy enough tripod that works with that.
I've had Lexar, Transcend and Sandisk cards. All of them could fail. All of them are reliable though with good warranties. Flip a coin and buy the fastest, largest, cheapest one that's on sale (and get more than one - safer with two 32s than one 64). If forced to decide, I'd probably choose Sandisk. Sometimes have had formatting hiccups with Transcend.