As has been mentioned, I buy the aftermarket parts and decals even for a "if they ever make that model...", then I have most of the stuff I'll be needing. If after 5 or 10 years nothing has come out, you can always resell the stuff to someone who missed out on them the first time around.
I have master "wish list" of models I want to build, down to the loads for each plane, paint schemes and squadron ID's. Whenever I find something for the list, usually a useable set of decals, I grab it just in case.
Thanks to everyone on this site for giving us the updates as they are available, I know I w