Where do you live that the Ibanez is 400 dollars cheaper, wow, that's awful...
Anyway, the Ibanez comes stock with terrible, terrible, terrible pickups, whereas the LTD comes with good old real EMGs. That alone may offset the cost seeing as you'd have to replace the Ibanez's pickups. Secondly, I can't stand the Ibanezes in that price range, they always feel cheap to me. LTD is a much safer bet though, as it has pickups that are good, it has a nicer neck and finish (my opinion of course). The quality of the bridges would be about the same, with the LTD being a million times easier to upgrade.
Here's the pros and cons I can think of in list form
LTD
Pros
-Good pickups
-Good neck profile
-Better nut
-Common bridge design
-3 way toggle instead of blade (:p)
Cons
-...Not an actual ESP? That's all I can think of.
-More expensive for you not taking pickup changes for the Ibanez into account
Ibanez
Pros:
-Cheaper before pickup change
Cons:
-Terrible, horrid pickups
-Would have to change them
-One of a kind bridge that has no upgrades
-Would have to enlarge the hole for the current on/on switch to make room for another pot
-Battery cavity is stupid, made for AAs or something instead of a 9v