A lot depends on your budget, and your anticipated needs. The equipment you see listed in my sig below is what I purchased initially, and I do not regret a single item. Having said that, though, I will say that the 18-135 and 70-300VR cover 95% of my shooting. The 50mm and the 10-20 are for special situations, and honestly do not get used much. Ditto for the SB-800, although I wouldn't want to be without it.
Of the options you listed, #4 makes the most sense to me, unless you already know that you will want a long-reach lens, in which case the 70-300VR is a good choice, if you have the funds to stretch for it. The 50mm, at $120 or so, is a bargain, and would be useful in some situations at WDW. I used it on Great Movie Ride and Carousel of Progress, but that is about it. I could've used it at night, too, but we were "on the run" so much that I really did not have a chance to do much night photography.
As I think I said in the other thread, having the extra reach of the 18-135, vs the 18-55, made that a no brainer for me, and the overlap between the 18-135 and the 70-300VR means less lens changing. I'm VERY happy with the sharpness, color, contrast, etc of the 18-135. The main complaint I've heard concerns the build quality (plastic mount, etc) and have read some posts on dedicated photo boards about the lens having to be returned to Big N for repair. For the money, though, I think it is an amazing lens, especially if you don't bang it around. For an example of the edge to edge sharpness, look at the photo of the kids' choir or whatever it is in the
DPReview D80 review samples page (scroll the thumbnails to the right to find that pic...I think it's the 13th from the left). Download the full res image and then zoom in on it. I think you will be impressed. Do note that not all of the pix on this D80 review are made with the 18-135, though.
Good luck; we'll all be looking for some great pix from you on this forum!
~Ed