FWIW:
I started building my own PCs before some mapcorians were born. Always been a PC / windows guy.
In July 2006 all the laptops seemed like shit so I bought a Macbook Pro (MBP). Ran bootcamp with WinXP. Hardware lasted 4 years....it was glorious.
In Nov 2010 I bought another MBP to replace the 2006 version. Bootcamp again...with WinXP again. Amazing results
In Nov 2014 (about 4 weeks ago) I bought a retina-MBP (rMBP)...bootcamp again but now with Windows 7.
http://store.apple.com/us/buy-mac/macbook-pro?product=MGXC2LL/A&step=config#
Got the 2.8 ghz option. Also bought an external optical drive to install Win7 OEM (64bit) from a disc. (use whatever PC OS you want).
Then you get both Mac and Windows. Windows under bootcamp, imo, runs better than parallels or whatever other stuff people use to switch. However, I don't need the Mac side...I need the windows side for various database software I code in...and then the entire reason Microsoft has not gone out of business: Excel. the Mac version of Excel is nerfed and you can't code VB in it like you can on the windows version. I run a ton of optimization and data processing code through Excel hooked up to mySQL databases through homebrew web protocols that is simply not possible in Mac Excel. If it weren't for that I might be a Mac OS user...but then there is the broader selection of games on windows through Steam and shitzles.
Just my 2 cents. Good luck!