Well, I can't find a way to register for chardev, so it doesn't look like I will be able to link the profiles I've made, but here is my stat comparison.
Rules:
Orc frost dk.
All the main enchants, using crit > hit for back, and mastery/speed on boots.
160 expertise/160 haste in red sockets, 160 hit/160 haste in blue sockets, and 320 haste in yellow sockets and prismatic sockets.
Reverb meta
When over hit cap, replace hit/haste with either haste/stam, or pure haste if the socket bonus is worth less than 160 haste.
Reforging:
If the item has hit, reforge it away.
If the item doesn't have hit, reforge the weakest stat.
If the item doesn't have haste, reforge too it.
Profile 1: BiS list
16253 str (1 * 16253) 16253
2566 hit (.674 *2550 + 0*16) 1718.7
2580 expertise (.674 *2550 + 0*30) 1718.7
9304 haste (.597 * 9304) 5554.488
4120 crit (.394 * 4120) 1623.28
1764 mastery (.339 * 1764) 597.996
Total 27466.164
20648 stam
Profile 2: BiS list with tier legs replacing
[Jang-xi's Devastating Legplates]
16364 str (1 * 16364) 16364
2541 hit (.674 *2541) 1712.634
2559 expertise (.674 *2550 + 0*9) 1718.7
8579 haste (.597 * 8579) 5121.663
4678 crit (.394 * 4678) 1843.132
2333 mastery (.339 * 2333) 790.887
Total 27551.016
20538 stam
Obviously these numbers aren't final, but they should make the point that the two choices are quite close, and that even with the tier legs it's possible to reforge away all that hit with the minor sacrifice of missing out on some socket bonuses, yet the benefit of using Jang's legs is also minor.
These numbers assume that chardev is accurate, and as it's still telling me I need 8% hit, I can't say that for sure. The ratings appear to be accurate though.
I'm personally putting the tier legs back into my BiS list for the time being, until other people can confirm or deny this.