I found this thread interesting - esp since I have been spending a great deal of time researching what I want to start buying in the way of breeding stock (a stallion and a few mares).
I have no idea what the American Sport Pony ‘ideal type’ is supposed to be - because to me a ‘speciality’ driving animal, dressage animal, and eventer must have very different qualities. I have not looked up AMerican Sport Pony info in quite a while - have they gotten a more defined criteria?
I went to an A hunter show in Raleigh a few weeks back, and low and behold I saw a small ‘welshy type’ pony - with an aspr brand on its butt. To me this pony was VERY HUNTER in type and movement.
I am EXTREMELY fond of the ‘look’ of DEL’s aussie ponies (Ascot Stud).
I have been studying their type for about 6 months now. They have fascinated me in type and looks. Exqusite!!!
From the pictures they do seem lighter in bone, but they seem VERY correct (vs weak). They look very athletic - very ‘cat like’.
BUT I will say - based on how she said that the aussie pony was a SHOW pony (hack and hunter I believe she said) - I know that is not the hunter type here in the USA. Our hunter ponies are supposed to go wither/poll level, nose poking out and certainly not any sort of knee or hock action (daisy cutters). As Pwynn said - seems our hunter crowd over here wants QH type flat not active, non reactive type ponies for the hunters.
Couldn’t imagine kids on 12 Handers in double bridles in the hunter arenas here! LOL
What is the suspension like on the ‘typical’ aussie riding pony???
My starter stallion is an Arab that I have bred to a few ‘heavier’ pony mares - and I have a very nice arab mare that I am cross breeding to other breeds/types. Though I plan to replace my stallion (with possibly a welsh), I like the half arab offspring, and think I’d even like a 1/4 arab type cross back to either Welsh or TB depending on what you had to start with - so thats where I think I am going to go with my breeding program.
And I am beginning to really want to stay associated with a breed registry as an extra measure of something for my offspring to fall back on. I just worry that the ‘sport pony’ movement may just fizzle out 
I like the Arab / Welsh cross - which would keep with a 1/2 hoof in two registries in the mean while. A dash of TB here and there would ad too the mix nicely.
I certainly hope the ‘other than hunter pony’ markets open up in this country to support our breeding endeavours.
It would be great if BOTH disciplines opened up PONY divisions for adults (I know several women who are 5’2" and really realistically fit on 14 .2 hand animals!!!).
There is no shame in recognizing those ADULT riders who do not have Olympic aspirations and really do enjoy riding the smaller equine - and giving them realistic classes to perform in.