I was a PC User for as long as I can remember. I used windows since Windows 95 and all the way up till Windows 7. I got a chance to buy a MacBook Bro when I joined college. And then it suddenly flashed how I wasted all my childhood with windows. Linux at least would've been better. The reason I say this similar to that of other people who made the transition.
The whole OSX ecosystem is very user friendly. The learning curve is shallow and once you get used to a Mac, you'll really start questioning how you did things on your PC before.
I'm both a designer and a developer. And my Mac gives me the best of both worlds. I can both develop freely with no worries on my mac with no terminal or bash problems(unlike the command prompt). Also, all the designer tools run very smooth on a Mac. There's a reason why all professional artists use Mac.
The popular saying goes "Once you go Mac, You never go back". You really don't.
The decision might seem hard with so much to cost on a product. One thing I can assure is that it's worth it. You can take the leap.:)
P.S. There are some shortcomings with the latest OSX releases, but I think Apple will fix all of them eventually making for a better user experience.
I use a 13" macbook air it has plenty of power/screen size for development so you don't have to go top of the line. (You can add an external monitor for less than $200, asus monitor $150, $10 thunderbolt to hdmi cable on Amazon). You can get a 13"MBair refurbished or on sale at best buy for $849 right now.