I've been using a Zoom MRS 1044 for the last 2 years, and have no complaints whatsoever.

It sounds to me that what you are looking for would be something like the Zoom MRS4 - digital 4 track recording. Try this - http://www.soundslive.co.uk/moreinfo.asp?id=200 - there's one there for £169 + postage. Well worth it for what you are after.