Been following your 2nd shooter discussions with some interest Lee. Def seems like a bit of a double-standard out there. I would suggest a used D700 @ around $1500. That's what I sold mine for last October.
Of course the D600 and D800 are both great too, and I would recommend them also if you care to reach that high. Of course as you know, the lenses are the real hidden cost of FX. As Thom has been want to write of late, the D800 in his (and my) opinion is the D700 replacement. Same introductory price, body form factor, features etc. only everything is better on a D800 as compared to a D700 (except fps). And 4 fps won't be that bad for weddings, nor is 5fps in 1.2-crop mode. And you get used to the image size. The D800 really is a great camera.
Sorry to digress from the main thread... back to the D400 now