I bought a pair of Elite Field Boots over 10 years ago that I have used consistently for schooling and showing and they are still in great shape. They are comfortable and come in slim sizes (which was good for me because I have skinny chicken legs that didn't work in most boots)! Elite wasn't terribly pricey a decade ago when I bought mine, but it looks like they have gone up. If you can find some lightly used or new on ebay
or somewhere, they're a great boot.
I have Ariat paddock boots, which are extremely comfortable, supportive, and long-lasting. Someday when I have to get new tall boots I'll definitely check out Ariat.