The horizon models are without a doubt quite breathtaking, but the only time you might able able to pick one up for a descent price is when it's been taken out of the box and a subpar paint job is applied. In the box I know many JP collectors have paid ridiculous prices for them, and built and painted by pros they are even more expensive still. Again, good, but rare and even rarer to find at a descent price; that and bear in mind a large number of collectors do not have model building/painting skills and would much rather have, say, the pros at Sideshow do painting with their near spotless track record for accuracy in color schemes for "movie monsters," etc. For a full maquette of the original T.rex with the color scheme movie-accurate, fans would be willing to sell their family members to gypsies.
Also, as concerns the King Kong dinosaurs, "A Natural History of Skull Island" is a spectacular read (as is "The Making of King Kong"), elaborating on the creatures that we saw in the film and many of which we didn't. The only qualm that many seem to have is that the carnivorous organisms vastly appear to outnumber the herbivorous, which is order for there to be ecological stability simply couldn't occur; still, in all fairness to Weta, the book never really gives numbers, just species, so for all the readers know, the fewer species of herbivores could still vastly outnumber the many species of carnivore in total population. The book discussed to some great length how the Skull Island dinosaurs are descended from the prehistoric beasts we know and love, and as the island was rocked by geological phenomena, it shrank more and more, plunging the organisms into a Darwinian arms race of sorts, constantly trying to overcome arsenals of the other carnivores and herbivores on Skull Island to outcompete one another. A very cool way of explaining the variation we see.
Also, as I said in another post, diorama pieces would likely be ridiculously expensive, but I'm still all for them; the T.rex perched over the ruined Ford Explorer, the T.rex pair outside the trailer, the Velociraptors in the kitchen, the Dilophosaurus in full attack display outside the jeep attacking Nedry, and the list goes on. The possibilities are really endless, but I think we'll likely see maquettes and busts when we see anything (notice I said when and not if).