Congratulations on your riding progress, it sounds like you are going well :)
As for buying a horse, I could tell you that you need to spend a lot of money on a nice warmblood or similar if you want a dressage horse. But if we're talking your first horse, there is little point in buying something talented and overly competitive. The best horse to learn from is an older schoolmaster that knows the ropes up to around elementary level (2nd, US??) Dressage that has nice rideable paces that you can actually manage rather than the bigger, bouncier more 'desirable' paces - you need to crawl before you can run ;)
There's a saying that you ruin each horse a little less than the previous one - that is just so true and a good reason in my books to not go out and expect to buy a world beater straight off the bat. Learn the ropes on old faithful first, then of you have the money start to look at more 'purpose build' types when your trainer thinks you are at a point of being able to take baby steps in training and improving a horse.
For me, I started riding as a kid and didn't get a horse until I was 12 - I was fortunate that my parents had land, and allowed me to save my $2/week pocket money to buy a fat, hairy, grey barely broken welsh pony (who is still living out her retirement in my paddocks). From there I had tbs, qhs, appys, Arabs, stock horses and various combinations between until I broke into the warmbloods by leasing a school master mare, then a crazy but talented gelding, and purchasef a cheap 'fixer upper' very well bred ang tale tes Hanoverian gelding. Eventually I was able to afford something a bit nicer, and decided to buy a weanling Hanoverian colt - trust me, they are cheaper when they're younger! He is now 3 and broken in.
Don't be in a rush to buy a 'Dressage' horse as any horse will help you learn the basic drill and honestly, I think the people who start off on the 'scrubbers' end up being much better riders for it in the long run.
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