Zenfone 2 fanboy. Been posting that zen 2 smoke out note 4 everywhere. 

Gold for the exclusivity.

Nope, unless you stay in kit kat
But right now all I think all brand new set straight come with lollipop
Good luck

I just love that feeling when decided to shop for a new gadget. You must be excited 
I'd say white or bronze gold. Bronze gold is definitely fun to play with. You dont see many carry this color
But then it's up to you.
If i'm not mistaken, the black one has more curvier screen edge compared with others thus you may find a little more difficult in finding a fitting tp glass for it.

Ps : waze still has the graphical issue on lolipop

UAG is good, but quite expensive
last time use on my s3, very nice
right now I using ringke fusion mint colour match with my gold note 4

*side note, if you buy gold colour is quite difficult to buy casing to match note 4, good luck
got colour one ???

I hate those colour tempered glass one, looks ugly
but should be same
some forumer here using it
but I saw somebody using it on their iphone 6 say the colour metal break already
so better don't go with it, better go for slim / tough armor
else best choice, go for ringke fusion, a lot of us using it
before that I using slim armor gold colour, is nice but quite heavy and make my phone more bulky, harder to put inside pocket

Lolli is nice just that some encounter bugs while others are fine. Really cuba nasib scenario here. So far i updated, im quite happy.

As for the charger - i think no issue. But u wont get the fast charger function. It'll just work as normal charger.

change this to Max4G ?
refer attachment
try an app called leandroid, I saw somebody post this in xda
I just try yesterday, looks good
need root then only can remove the heads up notification

those RM 30-50 one just class 4 only
class 10 one at least RM 50 (depends which capacity)

So far the only problem i had with Note4 after lollipop update was crazy battery drain. I hope they get this to fix it fast. =(

maybe try connect your laptop or other gadgets to the wifi and see if you can get internet access from those?