I love the spell Scream of the Ancients, nice STA debuff coupled with a great elem/nox debuff for the casters and scouts in your group. This spell is always cast by me first. Always. If you're raiding, unfortunately, you need dang near everything in our line as high as you can get it. Heals, buffs, and debuffs, imo, in that order. If you are THE Mystic in your raiding guild, buffs are especially a priority, since you will (hopefully) be in the MT group. Our damage spells should come last of course, unless you find yourself soloing alot (I did, I loathe soloing, but the Peacock line is a great time-killer when nothing is going down). So....
If I was in your shoes, I would buy an WIS imbued pearl ring and Scream of the Ancients. The nice part was that I didnt find many "had to have" spells level 55-56-57, aside from our minor heal, so you got a couple levels that you can get by with just upgrading to Adept 1. I still dont have Transcendant Grace even scribed, that's what the pet is for.
The most important part is to keep harvesting
You'll need alot more rares down the road.