The value still counts though.. When I got 60 mage and wanted to do mage arena, I thought it would be safer to get to the members gate in f2p wildy (didn't know bout ardy lever then :( ) I died and still kept the 3 most expensive things i was wearing (mystic top, bottom and glory I believe it was) even if they were members
In general the higher level monster has the best chance to drop it. I heard Shadow Warriors under the Legends Guild are good droppers, although I never had one myself..
If you want a Melee helmet, the Berserker Helm is the way to go as it has a +3 str bonus which might increase your max hit.. Another possibility would be the Warrior Helm, but as mentioned before it only gives Slash attack bonus, so it's not suitable for every weapon.
You need 40 mauls or 33k chaos I think to get the 300k TokKul. 40 mauls would be 4mil, but are quite hard to get.. 33k chaos at 150ea would be 4.95mil, but cheaper if you can buy for less than 150ea.
I know lyres can shorten the trip, but the spawn still is quite the distance from the lyre tele spot. It might be a little shorter, but keep in mind you have to waste a raw shark after every trip to get it charged again (or a bass with RoC)..
Its called TokKul and is the currency of the TzHaar city inside the Karamja volcano. It is used to buy various runes, gems (the valuable Onyx aswell, to make a Fury ammy) and Obsidian equipment.