Original R-09 records to SDHCs of up to to 32gb
Has the input jacks on top (use a right angle mini jack cord)
Tops out at 48khz (higher is available via the hidden menus, but not confirmed to be glitch free or to actually capture frequencies above 22kHz)
Has digital optical out (a unique feature not on most other handhelds that most people don't care about)
Works just nicely with an external preamp > line-input (or into the mic-input).
Is somewhat lacking compared to the others using the mic input due to noisier gain.
Is lacking even more compared to the others using the internal mics (honestly they suck).
Use it with an external preamp and you're all good.
Things I like about the original R-09: it's menu and ease of use simplicity, it's smaller B&W screen, screen remains lit, push-button stepped gain, inputs on top, digital out (yes I use that), 32GB sdhc, standard AA power, acceptable run-time.