Apple after care is great, I've had to use it twice, first time my iPhone 5 on off button was not working so they swapped the phone for me there and then, phone was less than a year old. Second time one of my work iPads had stopped working, screen would just show coloured lines every time it was...
I've got a spigen tough armour case, it's a little bit chunky but my young kids use my phone sometimes for games so I wanted something a little stronger, I've also got a tempered glass screen protector which is brilliant and a lot easier to apply than a normal film protector...
I've got the 6plus, it takes a bit of time getting used to the size but now I don't notice it (I've gone from a Galaxy S4 to the 6plus which isn't as big a jump in screen size as from the iPhone 4). I've never had a problem with it sticking out of my pocket.