Can't find an app to read full google reader rss articles offline

Hello all,

I need your help cause after days of trying to find the right app for me, I'm about to give up. I'd like to find an app that :

- is free
- connects to my google reader account
- download FULL articles (and not just reader previews) and saves them on the iphone to read them later
- could be set up to automatically download the last 20 or 50 articles anytime the iphone is connected on wifi


Basically, since I got a blackberry for work, I stopped my iphone subscriptions. I now use it as an ipod touch basically, to listen to music, watchs videos on the go...

My iphone is now connected to my home wifi, so what I'd like to do is having my iphone download my rss articles so that I could read them on my iphone when I take the train everyday.

Can you help me identify the right app for me ?