If you're not going for 4 piece tier 10 be sure to pick these up. With 277 you'll be using most other slots for haste gear rather than leggings, and you'll need the mp5.
The heroic tier legs again lack a socket but the raw stats overpower most other alternatives. The only reason they are number 2 is because of the missing socket, otherwise you'll wear these to get 4 piece tier 10.
I like them more than Woven Death because of the higher crit (more regen) as well as high haste. Being plate and looking way better doesn't hurt. Even though the haste on Woven Death is weighted a bit stronger, these are preferred.
These are the choice leggings for highest regen at ilvl264 with crit and mp5. If you're not sporting a great deal of haste, I don't recommend dropping haste on leggings until ilvl277 gear, but if you are these are easy to obtain.
With 3 sockets these are the definite BIS leggings for paladins. It will be a hard choie between these and the chestpiece to attain the desired 4 piece tier 9.75, however.
The normal ICC tier leggings disappoint, being worse than Coliseum alternatives. They're worse than all 4 ICC alternatives of the same itemlevel, though you'll have to wear them to get 4 piece.