I grew up on mechanical keyboards but after testing a bunch in a computer store, I realized I no longer care what kind of keys I use. It could be that I just got used to the Apple chiclet keyboards, but who knows.
My keyboard has four switchable profiles and 22 programmable keys, which means I can have 88 combinations. I mostly use the keys for launching apps and Sublime Text shortcuts though.
Not bad for around $100.
I had one of those dodgy early 2011 15" MBPs, and if I didn't have AppleCare, I would have been stuck with a costly motherboard replacement when my GPU croaked the first time. Granted, my MBP did eventually die after my AppleCare lapsed, but knowing you can get decent support in a major North American city on your warranty is something I value. I'm not sure that Razer (or ASUS, MSI or Gigabyte, for that matter) is well equipped to provide that level of service.
The only laptop I ever had that needed warranty service was my Macbook Pro. Good thing I got it, the logic board replacement cost more than the AppleCare did. Not that it helped though, my model of MBP had a design defect related to the GPU overheating and my laptop died after the AppleCare lapsed. Apple "recalled" it and fixed it, but not until after I bought a new laptop.
I've never had any issues with my non Mac laptops... None that required a major repair under warranty, at least.
The thing with third party warranties is the "put to the test" part. You never know how it's going to turn out until you need it. The thing with AppleCare and warranties from Dell/HP/Lenovo is that they are lower risk in my opinion.
That's not to say that third party warranties are bad, I just don't have much interest in trying them.
I generally look for a quad core i7/HQ and a discrete GPU. I guess I could probably live without the discrete GPU, but if I'm going to buy a good laptop, I may as well spend a little extra to get it.
Battery life isn't a big consideration for me - I'm plugged in most of the time and I consider any battery life >3h to be gravy.