Switching from iPhone to GNexus, need some suggestions

I'm not too excited about the changes I see coming with iOS6 so I ordered a Galaxy Nexus yesterday and I'm in the process of moving everything into Google.

The apps I use the most are pretty much just Twitter, Reddit, and Instacast (podcast app) and I was wondering if you guys could help me out in finding what is going to be best apps on Android? Thanks!