If you're looking for an athletic breed, you want an akhal-teke. Most of you might say "an akha-what?". They are one of the worlds oldest horse breeds, so old that there is a 'chicken or egg' question about them and the arabians; did they make the arabians more pure or vice-versa? I personally belive in the first theory. One of the many TRUE stories are:
"In 1935, fifteen Akhal-Teke horses were required to travel from Ashkhabad to Moscow on a forced march of approximately 2,600 miles and 3 days without water, including travel across the Kara-Kum desert of approximately 255 miles. The entire trip lasted approximately 84 days"
My mare is an AT, and she was ridden in a 1day event(by my sister), she got the highest scores, but the judges messed it up so she got eliiminated. However, the next day our stable manager asked my sister to show her dressage to music test to this really good dressage rider BECAUSE she was
A. 1 of the only horses good enough to preform it
B. She was the ONLY, ONLY horse (that was in the 1 day event) that did not have any injuries or anything. She is about... hmm... 155 cm high, that would be roughly....15' something hands.. but that's not the point. The point is they are one of the hardiest horse breeds EVER... you should look them up... besides, there is no horse that has a coat that shines like the akhal tekes... in fact, they are sometimes known as "the golden horse"....
I do hope you consider them, they are lovely, loyal and gorgeous..