I was skeptical of some posts made a month or two ago that touted the internal mics on the Sony D50. However, I recently bought one of these on the strengths of its other features (wasn't planning on using them, so I didn't care about the internal mics). So, I recently did a festival where, after initial set-up, I thought I was recording through my Schoeps mics (line-in) but the switch on the D50 was accidentally set to the mic-in position, which means that the internal mics (sitting on the ground) were being used instead of my Schoeps mics (flying 10 ft high). I applied a small mount of EQ to bump the highs, but here's what resulted...
http://www.archive.org/details/roothog2010-04-16.d50.16bitTherefore, if I were you, I'd buy the D50 and use the internals for stealthy recording. Save up and buy a good pair of mics and preamp for open recording. Second plan would be to buy the D50 now and use the internals now...and order CA-14/ST-9100 to use either in stealth or open mode once they arrive.
I've now used the D50 and the R09HR and, while I really can't say anything bad about the R-09HR, I just think the D50 is worth the extra money because it's just a really solid recorder. The all-metal construction and great feature set really differentiate it and set it apart from everything else that's out there. Best of all, it goes between 20 and 25 hours on a set of batteries. The R-09HR is plastic and goes about 5 hours. The only negative to say about the D50 is that it uses Sony ProDuo media...which isn't all that big of a negative.
The D50 fits in a shirt pocket.