This is an old thread, but I can fully endorse the Reaper Bones Ogres (Smasher, Clubber, Guard) as awesome replacements for the classic originals. I have grown to like the style of the classic GW Ogres which looked like bigger, fatter, mutant versions of the classic Orcs. However the Reaper ones just look that much more menacing, like they really would block the whole corridor and take a lot of damage before going down. They're taller and wider, but when it comes to Ogres which are supposed to be big in general, this is fine, even a benefit!
As far as size, they have built in bases, but if you were to give them an approximate size base (which I did), it is 25x25mm. So they will fit on the classic board, unless you had a bunch of them all lined up in the same area I guess. A couple of the Reaper ogres have a "wider stance" meaning you would need to consider them as a two-square monster (equivalent to the Frozen Horror or Giant Wolves), and so to base them you'd want either a 20x40mm or 25x50mm. If you can fit those monsters on your board, you can deal with these guys too. Honestly, for the price, you're getting a good looking figure that can work, even if he doesn't have cool interchangeable/movable limbs and heads!
Here are my substitutions:
Ogre Warrior / Ogre = (reaper bones) 77456 Ogre Guard
Ogre Champion = (reaper bones) 77455 Ogre Smasher (double wide base)
Ogre Chieftain = (reaper bones) 77105 Ogre Chieftain
Ogre Lord = (reaper bones) 77566 Ogre Chieftan (double wide big base)
Ogre Mercenary (homebrew) = 77454 Ogre Clubber
Cheap base solution:
uxcell plastic end caps Finished examples
here As you can see, I painted in solid acrylics, and slapped the base right on the bottom without trimming anything. But this should give you a rough idea. Even accounting for the base, the Reaper versions are at least a head taller.
You do not have the required permissions to view the files attached to this post.