I guess it all depends on the detail and sturdiness Albert is looking for in the helmet. And which helmet. And your preferred price. Lots of options, but you need to pick how much you want to spend. Price VS accuracy thing.
I’ve turned the 21C ones into a nice helmet with some rework and paint. If I could figure out how to get pics loaded right now I would take some for you. I’m having tech issues haha.
I wasn’t overly impressed with the HT one. The details were nice, bit I found it too thick, and not very flexible. Which made it hard to get onto a head. And they had to be smaller ones, or ones without a big hairdo. And too expensive as you mentioned. Might as well buy the whole figure.
The BBI Apache pilot helmet suffered from being a bit big, so it was loose, at least on the original head. I found using those foam liner inserts from other helmets really helped sort that out. The unused liners that came with helmets from soldiers that had headsets, and wouldn’t fit with the foam liners in them and the headset at the same time. It’s a great helmet, but specific to the Apache, so it’s pretty much useless for any other pilot. And soooooo expensive loose now.