The short version is the actual "shell" of the helmet doesn't matter too much, what does, I think in roughly this order:
-retention system
- shroud*
- padding
-shell
A real team wendy exfil would be really good I think. If you can find one, and can afford it, get one and maybe consider replacing the padding later. That's the short answer. Or you can pick kinda any bump helmet, and replace retention system, padding and shroud - in that order.
Longer answer:
I had the FMA replica of the exfil for a while and I think the value for money is really good there. It's a common assumption that you need a high quality shroud to make sure the night vision doesn't fall off. I think this is true, sure, but I did not have any issues with the built in shroud on my replica helmet. What I did have happen, is the retention system broke. After around 2 years of use. I'm not sure how many hours this was with night vision but quite a lot and i paid £35ish for the helmet all in. I put the * by shroud because you do need a good shroud, but I'm not sure you need a legit RS shroud. They aren't the most complicated things at the end of the day.
This is personal preference but looking at it, there is basically nothing I like about the PTS flux helmet. it doesn't have an "on the fly" retention system (like the boa the team wendy comes with, or the ops core occ dial) which I think is almost essential for reducing wobble and comfort and the pads look kinda naff.
Likewise padding is very important because comfort is king and you kinda need to wear these for long periods of time.
When my suspension system broke I replaced it with the following, and also ordered some pads whilst I was at it. The (replica) TW pads are nice, but these are nicer and worth the money imo.
https://protectiongroupdenmark.com/shop/5-ballistic-helmet/25-pgd-dial-retention-system/
https://protectiongroupdenmark.com/shop/5-ballistic-helmet/26-pgd-10-pad-helmet-liner/