The thing is, we might not have a choice ;(
I would just buy the Sony Portable Reader now, even if I need to spend another $600 for the iRex in September. But as one of our readers claims, it's possible we won't see the Sony either before end of August. Bummer!
Then there is the Jinke reader, which is supposed to hit European markets soon. I noticed TaKir uploaded some recent photos of the V8
on our Wiki. The longer we have to wait the better the Jinke seems to me as an alternative.