Upload & Sell: Off
First of all, there is no "right" to go FX. You haven't "earned" it, since it really isn't needed :P
FX vs DX is more of a need-based issue rather than a right, unless you're talking about finances! But I'm sure I don't have to lecture you on DX vs FX moves and needs, as I'm sure you've heard it (or can find it) in the forums.
If you want to go FX, and want a D800, I'd say go for it! The image quality is amazing. The 14-24 is a great lens, as is the 24mm PC-E (one of Nikon's latest tilt-shift). I rarely use tilt AND shift at the same time for doing regular work, so the lack of movement options between the two doesn't affect me too much. Yes, I have run across an occasion where I wish it moved more like a super rotator, but it wasn't critical. The 24 PC-E really is a gorgeous lens. If you want D800 and tilt-shift, that is a highly recommended option.