Gossling,
I think your needs are similar to mine, as I'm going to record piano solo or piano and violins or larger ensembles (sometimes).
I just received an Edirol R09HR, but as I didn't have so much time I only "played" with it for a little while.
The other choice would have been Sony, or waiting for the Marantz
661.At the end I went for HR for these reasons:
1)a recorder is important, but mics are more important, so it is better for me to spend the money I save into buying good mics.
New techs and price lowering of devices involves much more recorders than other gear, so- nothing being "forever"- mics are something you'll keep for a longer time. This not being a professional taper, of course.
2)Between the Sony and the Marantz I would wait for the latter. This would "solve" the entire question about Phantom Power/portability etc., while the Sony has better preamps than HR but the same limitations in terms of connections, with a noticeable price difference.
3) I did some experiments with my R09HR. The onboard mics are not bad; I compared them with a Sony ecm.907 (not a great mic, I know) and they are much better in terms of bass response and general clarity. So for rehearsal they are ok, but they would suite even for recording; if you can place the deck where a mic should be placed I don't think hiss will be an issue.
4) External mics with internal preamp: I know the tests I've done are anything but "scientific", but I would say that mic preamp is quite good.
While I said HR's internals sound better than Sony ecm907, the hiss with this external was maybe slightly less. I know this mic pretty well (I used it with a dat Sony deck for "fast" recordings); it is noisy and low-sensitivit- not more than 3-4 mV-.
The recording level with the internals is just about the same I set with ecm907 in order to get a similar signal.
So, if you use a couple of good condensers (uncomparably lower noise and more sensitivity) and set the sensitivity on "low" you'll still should have a much more clean gain than I have with this little mic, so you can get a good signal with lesser gain than the one you set with deck's internals.
5) Line-in directly: there is a possibility to go straight into line-in with a sensitive mic.This apply to loud sources, of course; I have tried with my little sony mic to do this, and the level is too low with the mic set at 60cm. distance from the strings.
But this mic is very low sensitive(3-4-mV). Probably good mics, going from 12 to 30 mV depending on the choice could provide a good output in order to go line-in with mics close to the source.
6)For what concerns the choice of mics, I'm waiting for advices too, even about the sensitivity, which - as Dsatz in another post wrote, could turn to be an issue overloading the input; this could possibly apply to the mic-input (not line probably) but maybe the 10 db pad featured on most mikes -expecially sensitive- could prevent this.
Please consider that I'm a musician and I'm far far far to be an expert in gear stuffs; I just reported some listening impressions and I'm waiting for advices too.
If something or all I've said is wrong PLEASE correct me. There's nothing worst than someone pretending to be an expert of what he doesn't know, and I don't want to give this impression.
c