On rare occasions I've noticed a very slight moire in D1 photos - typically showing up in hair and certain types of fabrics, but you've really got to look closely to see it.
Vic - I've been playing with that D1x NEF too, and it looks mighty impressive....
If you're going to give a D1 a go then make sure you try RAW/NEF mode since the colour and amount of detail are superior to the JPEG or TIFF modes. Also give QImagePro (http://www.ddisoftware.com/qimage/) a try: it's interface isn't as good as Bibble's, but you may prefer the output - I certainly do.
You'll probably find you need to fiddle with the settings of both programs to get things looking just how you want. When you use the defaults Bibble may look a bit dark in the shadows, while QImage is a touch under saturated for my taste.
If you end up getting a D1x then you'll definitely be going past 8"x10" - and I'll be green with envy!