I can get up to 3,000 health on my 20 Rshaman and about 270 spellpower, I can't get anywhere near that on my 24. That's without stam stacking. I have been really seriously thinking about leveling a toon up to 22 and picking up a few pieces of key gear to see how they scale so I have access to silver lined belt and most importantly frost shock.If anyone knows let us know.
I did some questing earlier this week to pick up 20-24 gear on a druid I have in the 40s to see how gear scaled in the middle of a bracket. The scaling was the same (45 = +4 ilevels, 47 = +2 ilevels).
A couple of the items I remember off the top of my head:
Heavy Silver Ring - 5/5's don't scale, +8 goes to +9
Silver-Lined Belt - 15 stam/4 int
Shield of Uncurbed Appetite - no scaling
Blackfathom Leggings - 11 stam/8 int/8 crit
Gloves of the Hero - not 100% on this one, I think it was 7 stam/4 int/4 crit though
Advisor's Ring - 2 stam/5 int/7 spirit
Legionnaire's Band - 5 str/5 agil/2 stam
Battle Healer's Cloak - 5 stam/5 int/2 spirit
Naga Battle Gloves - no scaling
Argas agility ring - no scaling
I know I picked up and checked out Cuffs of Black Elements, Stillwater's Signet and the WSG necklace, but I totally forget the numbers on them. I'm pretty sure the RFC bracers stayed at 2 spirit (instead of the 3 20's get from it) because I remember being disappointed about that while planning out a hit capped 22 shaman in my head.
I have a 37 ally mage ready to check a few more things (caster Argas ring, Yorgen's Boon or Ashen Gloves, etc), but I'm lazy and haven't gotten around to it yet. A lot of stocks gear needs to be looked at too.