Good, that's what I thought you meant.
I think the new products are arriving in February, and some are already posted at various e-stores. I recommend buying the newest model possible, as the bang-for-buck will be far greater in this category of equipment than almost any other.
I think Roland is the one putting out a new one that has a CD-burner built-in. There are so many new products in this category that I have now lost track. But if you visit Sweetwater's site, they carry most if not all of the brands and have them nicely organised by category.
My guess would be that audio quality would be of paramount concern, and that narrows it down considerably but still keeps you well within a $1000 budget unless you want to go all-out and buy one of the Studio Devices field recorders (we have several of those here, and they greatly outperform the Fostex that we had before at a ratio that far exceeds the price differential, but price is an absolute and not just a relative term, and Studio Devices recorders cost several thousand dollars!).
Although the Marantz recorders appealed to me ergonomically and because they also offered rack-mount models, they have consistently gotten bad reviews for audio quality when using musical content as opposed to speech for re-broadcast (which appears to be that company's forte when it comes to portable recorders). Fostex was probably first-to-market and gets good-to-very-good marks for audio quality, but reliability has not always been the best with that brand (although far from the worst compared to its historical reputation).
The Tascam portable field recorder that came out in 2007 has gotten the best marks for reliability, flexibility, ease of use and audio quality, alongside Korg's innovative digital stream-based recorders (one is hand-held and the other is field-recorder form factor, similar in shape to those of Sound Devices with which it is obviously positioning itself to be in competition with). Yamaha, and I think also Tascam, are now adopting this future-proofing recording format as well, and it is especially well-suited to classical music and other forms of music with lots of dynamics and which may have very non-linear data saturation.
As organ can have less dynamics than an orchestra or a piano but can also have the most dynamics of almost anything (considering some of the large installations out there with gigantic low-frequency pipes compared vs. just the flute stop on high notes), best to err on the side of needing maximum headroom and best audio quality for a reasonable budget.
Roland makes very good recorders but most of them are being tailored to one degree or another more towards the video or video production market (with the exception of the small handheld R-series and related models). Those are variably sold under the Roland or Edirol name.
All of these devices, except maybe the lowest-end micro-format handheld recorders, make it trivial to drag directly to CDr's to burn backups/etc., as they almost all have computer-based editors that ship with the product and many also have direct transfer functions available on-board the device.
I would specifically dis-recommend the M-Audio device as poor workmanship and also not even well-priced for its quality and functionality. In that range, the Zoom is a better bet overall and has also been updated more recently. You also have the testimony of several people on this forum that it has served them well in terms of reliability and quality. But I suspect that device would not be of ideal quality or ergonomic comfort for your clients, given the circumstances.
Especially for your application, you need long contiguous recording times, which is not supported by that many of the portable recorders. Some are battery-only and don't even offer an AC-adaptor option. Others can take mains power and some even have quality IEC cables (as options, at the very least -- except for the rack-mounts, all of these devices are designed with field recorder applications in mind, such as gathering sounds such as construction work or frogs in a pond for video post).
You will need to read the specs yourself to verify which recorders support non-battery power and also if they have limitations on maximum contiguous record time separate from power considerations. I recommend the Sweetwater site as a first pass at that data, then visiting the vendors' sites directly for the more detailed data (most also allow you to download the manual as a PDF in advance of sale).
Sound-On-Sound's website (
http://www.sospubs.co.uk) can also be searched for reviews on most of these devices, except for the newest ones which of course are mere speculation at this point. And yet those are the ones I most strongly recommend, based on the track history of those manufacturers for delivering quality and reliability (notably Yamaha, with Tascam at least being very good at support in cases where there is a failure). Of the already-released stuff from 2007, the Korg and the Tascam consistently get the highest ratings for audio quality and reliability as well as ease of use and integration into the workflow.