I'm surprised no one offered this:
Buy property. You are going to want your own place eventually, property is almost always a good long-term investment, and as you appear to be relatively young, _now_ is the time to get started.
I was offered this very same advice in my mid-twenties. I wish I had followed up on it.
Other than that, you will want a truck and horse trailer, probably within minutes of getting the horse, so that would be something else to start looking for.
These are high-dollar things, yes, but you will find that money disappears alarmingly fast once you actually own a horse, and budgeting for the big stuff becomes just that much harder.
Hope this is helpful. ByeBye! Steve
Steve Jernigan KG0MB
University of Colorado