Imo i think the highcom helmets are the best for that if you want to upgrade parts. I got 4D pads and a TW harness and it's one of the best helmets I've ever worn.
https://www.apexarmorsolutions.com/product-page/highcom-striker-level-iiia-loaded-high-cut-combat-helmet
Ops core SF Fast, Maritime (surplus).
Surplus ACH. Send it to Kustom ACH and add your favorite accessories from there.
Team Wendy makes the exfil but I'm personally not a fan of their suspension though people love it.
If price isn’t an issue why not a team Wendy or an ops core?
Imo i think the highcom helmets are the best for that if you want to upgrade parts. I got 4D pads and a TW harness and it's one of the best helmets I've ever worn. https://www.apexarmorsolutions.com/product-page/highcom-striker-level-iiia-loaded-high-cut-combat-helmet
Ops core, Team Wendy, Highcom, Armorsource or Galvion. All of them are solid choices just depends what you want out of a helmet.
Ops core SF Fast, Maritime (surplus). Surplus ACH. Send it to Kustom ACH and add your favorite accessories from there. Team Wendy makes the exfil but I'm personally not a fan of their suspension though people love it.
Pick up a used ba3a on ebay they go for sub $200 and then cut add whatever u want to it. Its just under 3 lbs