I'd be tempted, but I have a garage full of jets and helo's that scream, "No more!" Plus, the F-35 is about the least sexy modern fighter I've seen in a while. It just looks like a pud, and reports are that it flies like one too. My pretend plastic military deserves better. It gives off the vibe like, "I'm an F-16 that got modernized by a committee of journalists!"
The only things I'd get stoked to buy in 1:18 at this point would be an F-4 or F-22. Everything else would be deemed not worthy of the dollars and/or space.