I'm really not sure why you insist on staying at level 28. There's an entire dungeon's worth of gear you can get @ 29, with better scaling on BoAs and proc enchants.
Also: none of the numbers you've presented are impressive. My 29 ele shaman has 5700 hp and 297 spell power, without stacking stamina. I crit for 2300s on fulminations. My 29 Spriest has 5800 hp, 323 shadow power, crits for 1400 on Mind Blast and 2100 on Devouring Plague. Dots crit for 200-400. I could quite literally kill any of your 28s in about 2.5 seconds.
Lastly, you won't be able to use the level 100 enchants on low level characters when the expansion goes live.
Level to 29, make some real twinks.