Well, take into consideration that JGTH was the first movie to really crap out on the entire F13 mythology and, in my humble opinion, is at the bottom of the heap - even taking Part 5 into consideration!
I agree that FvJ is possibly the best of all worlds... he's huge, has a generic looking hockey mask, and if you're putting him on display with Freddy... well, enough said. Plus he's still pretty easy to find at retail prices.
Part 4 has potential, I gotta admit. And if Parts 6 & 7 were on larger bodies, I'd like 'em a LOT more.
My suggestion would be: Gotta get it now? FvJ. Can wait a bit? Part 4.
Or you can be obsessive compulsive like me. And get 'em all.
- Joe