Ok this is just out of curiosity and also to try and hunt down a certain piece of artwork...
There've been 3 Avatar incarnations models-wise since the Eldar came along as far as I know:
* The original avatar model which was not much taller than standard infantry, which seems to be supported by the size of the avatar seen in the excellent piece of artwork in the current codex (amidst the aspect shrine statues etc.)
* The current standard avatar model which would equate to being about 11/12ft tall (ish), now a monstrous creature so suitably bigger and bulkier - this guy has been in circulation for years now and is the most commonly used avatar and there's numerous pieces of artwork and fluff which features this sized Avi.
* The forge world avatar which is by far the biggest of the bunch, he'd equate to around 30ft tall if my guesstimations are correct - there was one piece of artwork which I can't find for the life of me, think it might have been in the 2nd or 3rd edition rulebook where there was a mahoosive Avatar that was this size facing off against a bloodthirster (or arguably Khaine vs Khorne) and I fell in love with that piece of artwork so it always made me believe and feel thats the size the avatar should be (hence my joy at finally getting the forge world model).
If someone could find out that piece of artwork I'd be incredibly grateful!
I was discussing the Avatar with a local GW manager and he was saying how his idea of the Avatar was always the first - the fairly normal-sized super warrior, where I described my encounter with the aforementioned piece of artwork always had the avatar in my mind as this enormous behemoth god incarnation, so I was just wondering what everybody elses preferences were in terms of both fluff and also the models and gaming.
I personally prefer the forge world one for the above described reasons and also the psychological effect it has on many opponents - along with my wraithlords it soaks up a lot of firepower from my forces which, when fortuned, it can really endure!
So yus, share your thoughts and opinions, and again if anybody could find out that piece of artwork I would be ecstatic!