Choose a microcontroller
Unless you are targeting a specific feature, nearly all microcontrollers are the  same.

How you choose can be up to you, but these are some of the things I look for when I am selecting a device or have looked for when choosing a device.


What's my experience with the device ? If I have used a device before, that experience of knowing what to do (and what not to do) can save time. Also, if I have used the device before, I may already have developer tools (programmers, debuggers, toolchains etc..) for that device. 
How much support is available ? Is there a large community that I can ask for help if I need help. The major players (TI, Microchip, ST etc..) have good communities and there are lots of projects out there that use them. I came across a Zilog product, and I haven't heard of Zilog in over 10 years, and I don't know anyone using Zilog (except for this one product). 
How available are parts / dev boards ? Getting a dev board lets you get up and running quickly or having parts that can be easily soldered or breadboarded (is this a word?) make getting up and running alot easier than having a custom board made or having to wait weeks / months to get started.