I notice the line in socket is at the top of the R-05 recorder, I'm not too sure if this is an improvement especially as it was my line in socket that was an issue with the R-09HR?
I have an original R-09 that's still going strong after 3+ years (knock on wood) and its MIC and LINE inputs are on the top like the R-05 (and the Sony M10). Personally, I prefer it that way especially in those
situations where I have the recorder in my pants pocket. No connections jutting out of the sides (as on the R-09HR) means things are less likely to get caught and break and the recorder slides in and out of my pocket easier. YMMV.
On another note, and I don't know if this has been pointed out in a different thread, I think a big reason for the price differences is that the R-09 series (and possibly the M10??) is made in Japan whereas the R-05 is made in China. Food for thought.