So here is some logic of mine, maybe it could be useful.
I've picked up 2x of those new die-cast 89 cars, for me and my friend. They are pretty cool to display with DX Keaton and Nicholson in some common 1/6 shelf as detolf. Since I'm more about Nolan's movies I've decided that it would be the best way.
I REALLY like first 1989 Tim's film, but huge 1.2 m. bat-mobile with only 2 figures to display - sounds and looks pretty poor to me. I HATE the second movie, btw, it's so odd and silly, almost can't stand it coz of it's plot-holes and oddness. So if you're fan of both Burton's movies - get Hot Toys, you'll get at least 5 figures based on those movies after all (Penguin, Cat and B:R Batman are on the way). Also get HotToys car if you would like to display it with Batman alone in some huge shining case. That's pretty sweet.
If not - get this Hot Wheels, it's quite cool and you'll have no troubles to display it. Like I did.
Some thoughts about Nolan's display. Yes, I'm getting almost everything based on this movie from HotToys (I did not picked up only Daemon Batman) and my Tumbler is stored in box now, but I'm going to order two huge org-glass boxes for tank+batman-B:B and pod+all other figures (Ra's, Scarecrow, Dent, 2 Jokers, Cat, Bane, Gordon, Bat-TDK, bat-light). It would cost me around 700$ with lighting system and those boxes gonna be 110x100x60 cm., so I simply have no free place and option to handle both bat-mobiles in my house. Probably I'm going to order those 2 boxes this February.
Still loving 1989 car's design so much! And it's cool if someone can get both cars from HotToys and display them in some appropriate way.
P.S. Where is my 1.000.000 USD for answering your question?