iPhone user moving to Nexus 4- now what??

I just got back from physical therapy on my finger (injured on Tuesday pressing 'proceed' 50,000 times on Google Play) and found my 'just shipped' email from Google! Hooray!

Now the question for all of you - this is my first android phone, after year's on iOS. My key apps are wunderlist, Pages, Twitter, National Rail (I live in the UK) and Instapaper. Everything else I think I'll be able to find just fine.

What are your recommendations for apps I should get right away? Do I need a 3rd party keyboard? Is there a great project management app you like?