I got an Epson 4990 yesterday and I'm very happy with it. From the reviews it looks like a nice little step up from the 4870. It's pretty fast and easy to use. The scans are a little soft but the detail is there so you just need to run a pass of USM. Haven't tried printing yet but it looks like there is more then enough to do medium size prints. Might want to get a professional scan for the occasional large print.
There was a post on photo.net comparing the D4000 to the 4990. The D4000 was a little better but not even near worth the $300 plus cost difference.
Some web samples here:
EDIT: Great photo you have attached there Andy.