"Normal" (as it is not Nex) GWD armour is enough to OSRS Gold perform Slayer tasks. Not too expensive (for people with resources) It doesn't require to be replaced and also gives offensive advantages. You should keep an Barrows set of every type of combat (Verac's and Ahrim's as well as Karil's) for the very few Slayer tasks that require high-defensive armour.
Glacor boots are the most comfortable boots for the moment. Barrow gloves aren't that good anymore, they're hybrid gloves so they do have their uses, but if I were you I'd get the TWW automaton gloves (Static Pneumatic, Tracking). They're the gloves equivalent to Glacor boots.
Amulet Of Fury remains an excellent choice, it is the most efficient hybrid amulet in fact. But if you have money to spend , you may want to buy a Saradomin's Hiss (second highest magic amulet after the Stream Neck), Murmur (currently the most effective melee amulet in the game) along with Whisper (best ranged amulet).
Melee weapons if you don't have chaos weapons. You can buy Drygores. They're more expensive, but they're better. If you don't wish to spend the money to buy a new weapon, you could just use your Saradomin's Godsword. (or go train Dung and acquire maul)
Magic weapons are available for purchase Virtus wand and book but they're even cheaper than Drygores. Seismic wand and singurarity are at a ridiculous price right now according to the ge price, that the wand costs 500Mish , however, it's worth two bucks. If you don't wish to Buy RuneScape 2007 Gold shell out a fortune, buy an Arma battlestaff. It's probably not as good as the Chaotic staff, but it's superior to SoL at least.