You would never think I studied Justice, eh? 

I'm running cgminer 3.3.4 and haven't upgraded in a while (as I heard the newer versions were having problems). My MinePeon is MinePeon Version 0.2.3
I see the latest MinePeon is 2.4 and CGMiner is 3.6 so it looks like they are working with the latest. Hopefully it is stable, I haven't checked the threads lately.
Will load all that up on my other Pi once the version is settled on.

Flemeister - I'd go with the Seasonic just as they have the top name in the area. ( I think the new Coolers Master V's are actually Seasonics in part.)
But I'm no expert and I know you weren't asking, just bragging. 

IAS