Things I like:
Very trainable, lovely undersaddle.
Has freejumped 4ft beautifully (due to old injury, I don't want to push her any higher for fear it might act up again)
Nice neck shape.
Has pretty good movement.
Things that need improvement:
Needs a stallion with a very good walk.
Needs a prettier head.
I don't like giants, so preferable a smaller stallion in hopes of downsizing, but that isn't a huge concern.
Better hind end shape.
More shoulder freedom.
I would like to avoid a stallion with a long back, hers is verging on too long for my taste (although I really like compact horses).
No greys please! I would be completly satisfied if I got a clone of her, she's a super mare, but there's always room for improvement! I always prefer fresh semen, but would do frozen as long as it is under $1200/dose and of known good quality. She is due to foal in a couple weeks with a Rubino Bellissimo foal that sold in-utero. I'll breed her to Landfriese II on foal heat. I am open to both Dressage and jumper stallions, I just want a good fit with her. If I don't keep the Landfriese II, then the next foal might be a potential keeper. Here's some pictures of her: http://www.secretambitionstables.com/roxannah.htm
Ariadus is not on the active stallion roster with Oldenburg (GOV), so you would have to apply for a breeding allowance and pay an extra fee to register the foal.
I agree with the Pablo suggestion. You might also want to look at Vallado at Silver Creek Farms - I think he is not terribly tall. The For Pleasure son For Play is also not tall, but I don't know much else about him.
Dr. Thomas Nissen of the Holsteiner Verband said of Cotopaxi - "An expressive stallion, Cotopaxi presented himself in Neumünster as a compact power package. His action, with an excellent walk, predestines him for jumping where he received high test scores and performed with an almost optimal (perfect) amount of carefulness, technique and potential"
Cotopaxi is officially 16.2 by the registries measure, Holstein stallion stamm 776 and is jumping in the Grand Prix ring and has produced 71 % premium foals in AHHA. Currently standing and showing this season in Eastern Canada and shipping semen throughout North America fresh and frozen.
He has a compact back, pretty head, uses his shoulder well jumping and free forward movement. His offspring are around his own height range, none to date over 16.2h and they are earning the reputation of being very willing to go to work over fences.
I don't know a lot about them, but I really liked a couple of "smaller" (since 16. 1 or 16.2 is "smaller" these days) stallions that were in the new BWP stallion book that arrived yesterday. Both are GP jumpers.
Ariadus will not help in the size department - there is one at a friends place that is a solid 18h Lovely horse, but big
The Ariadus' offspring I know are all downsized versions (both in height and length) of their mothers. Not only would the cross give you the highly sought after R-A cross, but you would pick up another cross to Ladykiller xx. You can never have too much Ladykiller in a pedigree
It's too bad you won't consider gray, b/c I have to agree with Portia...Torino would be perfect for your mare.
I agree with another post for Quidam jr (about 16 hands) at Jump Start Farm. They also have Balta Czar who is about 16.2 hands and has exactly qualities that you describe. They both can be seen at: www.jumpstartfarm.com