You can find all my dotfiles online: https://github.com/wunki/wunki-dotfiles
Also, i had less problems with arch than other distros, but more importantly, if you had problems it was significantly easier to fix under arch because you knew how everything worked.
As for IDE I personally use Sublime or Vim.
I had been reading mixed reviews about Thinkpads for a long time, but finally jumped in and bought one. It's easily the best computer I've ever owned, and it makes me want to work. I love the keyboard, the display is exactly what I need, it's easy to carry around.
If you go with a Thinkpad, buy the bare model that you want from Lenovo and then buy upgrades from crucial.com or another supplier; it's much cheaper than building the machine you want on Lenovo. I replaced the dvd with a bay battery, and happily get enough battery life.
Debian. Check online if the model you want run Linux fine.
Vim and then a bunch of scripts to suit your project. Build. Collaboration. Etc.
lenovo, HP, dell...
that's why the 1st option is asus or some other chinese/korean medium brand.
To be honest, I'm very tempted to switch to a Macbook Air/Pro for iOS development (I prefer to own just one laptop)
Honestly, I think it's dependent on the laptop hardware and distro though. I imagine Ubuntu has it working out of the box for most hardware.
Mac or Linux OS is fine (I prefer Mac)
Text editor is personally dependent on you
Windows 8 EditPlus