I normally get OSRS gold a KC of 20ish, it doesn't help becoming Barrow items more often but it helps becoming more runes/racks etc.. Just use the ecto once you loot the chest, recharge your pray points in the temple altar (I forgot the name but I think you know what I am talking about. (But I am a noob:P, if your stats are similar to mine you will find much better Barrow methods.

This is certainly not the best method but it's how I get it done and it works. Additionally, it is pretty cheap if you do it right, at least that I earn money every excursion (not much but nevertheless gain ) even when I do not get a Barrows item. Would not that just splash. Additionally, is there any quests I must do other then preist in peril (I better finish that one soon haha!) The accuracy of Slayer dart is not affected by your magical bonus, it merely affects how hard you hit with it so that it's better to take melee armour for better defensive bonuses.

Slayer Dart accuracy is influenced by your mage bonus (go kill metal slides in rune and compare it to Mystic, you will see a huge difference). Damage, however, is not. You will hit exactly the same in mystical as you would in rune. In terms of the black sally, it's really only worth using in the event you have a high defence level or are utilizing blitz/barrage too to sidestep. Sally is a bit more consistent then slayer dart, and iirc it hits more at 70 mage then slayer dart does in 70 mage.

78-80 Attack shouldn't take long at all, maybe a few days, maybe a week if you slowly. It's pretty slow exp., but it's decent cashwise. If you're striving for exp. And speed, I'd go for Yaks, Experiments, Flesh Crawlers (SHoS), or maybe Rock Crabs. Each of these areas will have an adequate flow of exp., in buy RuneScape gold addition to being quite casual and low risk.