Idea for a new rogue poison

Reading how healing now has come to a point (TBC) where you can pretty much heal out a rogues dps (ming blog #10). As wound poison isn't even good at 60 it is useless on 70.

Rogues should get a new poison with manadrain, kind of similar to the hunters manadrain. Perhaps a 5 stackable proc that with 5 stacked drain 200-250 mana per 3 seconds. Dosn't even have to stack with other rogues manadrain and it won't be overpowered in pve.

As it is now and will be even more in BC, casters will have it easy to kite rogues. (Think frostnova, fear, blink, sheep, ranged stun etc) We have few means to counter this and are often limited to cooldowns. in the expansion the old rogues stunlock will be alot harder to even concider and the stun that was our best way to beat an opponent will be in many cases pointless. And those that played a rogue know how important the stuns are. A manadrain to counter some of this would be a good counteract.