Although I am going to use mostly Asgard Orcs for my Mordor force, I have got a few of the old Grenadier line to use as Uruk-Hai.
They are bigger but as Uruks, they will be fine.
I agree with Dolmot regarding the hobgoblin option, very similar.
In fact, it may be the hobgoblin flavour that I have.....
There are also a few old Citadel orcs that mix OK to me.
Ugezods Death Commandoes work well for me as unit leaders, Uruks and Chieftains:
http://www.solegends.com/citboxes/bc4deathcommando.htmI have a few of these that I will be utilising.
Let me take a dig for you and see if I have some spares for you to try out.