As for recommended equipment, a Dark Mask or RuneScape gold even a Slayer helm is a absolute must. Beside that, you really only need a whip (or even a chaotic weapon from Dungeoneerin). The rest is left up to you. For starters, I would get Torag's plate and thighs, which supply the best protection-value ratio in the game (s'far as I know), black dragonhide for your magic-based missions, and start working on the Recipe for Disaster quest, which delivers the most effective stat-boosting gloves in the game. I'd also get a ring of wealth (can't hurt), an amulet of cherry and glory boots - the latter if you've spare change, it is just a very small Strength bonus. In general, the entire thing should cost you 2.5-3m.

Combine the two and powerslay! This means that you simply use your best att/str fostering prayers and super baskets in your own tasks, a cannon also in the event that you want to/can afford to. This will get you upwards of 100k exp/hr at higher levels, which can be as much or more than armoured zombies and bandits, and you also avoid looking foolish as a 138 with 70 slayer.

Gear should be: Barrows gloves, out of RFD. Dragon boots. Full slayer helm, black mask until you obtain it. Proselyte armour should you use prayers, barrows if you do not. Whip, try to get a chaotic rapier as soon as possible. Dragon defender, antidragon shield for dragon jobs (DFS is overkill, do not bother with a single ). Amulet of glory, attempt to acquire a fury as soon as you can.

While that does seem intriguing, does not that defeat the purpose of slaying? Part of the enjoyment of training Slayer is something new to kill every undertaking, sure, fine. But isn't it also to earn money? I'm pretty certain eventually prayer potions would run up the cost to Buy RS gold where I am losing money, wouldn't it? By the way, thanks to the advice everyone.