Hey, Phi. Sorry for the delay on this.
Here's some numbers on your requests.
Huge Titanium Helmet with Arctic Beast bindings\attachments - 1650 GP
Huge Titanium Helmet with Drakescale bindings\attachments - 1800 GP
Huge Mythril Helmet with Arctic Beast bindings\attachments - 1800 GP
Huge Mythril Helmet with Drakescale bindings\attachments - 1950 GP
Please let me know what you think. Thanks!