I like Friesians too. They are great horses for galloping around in the field and riding around aimlessly. But it is a heck of a lot of effort to get them fit enough to carry themselves for dressage, and then the rider must be very fit and skilled as well to get the horse to even first level.
They are not a "my first dressage horse" kind of horse. They are frustrating, difficult, lose fitness quickly and you must clip them constantly to keep the hair down enough that you can ride them without overheating.
Outline what your goals are, outline where you want to be and then pick a horse that is going to align with those goals. Otherwise, it is not fair to the horse if you are constantly picking and poking and whacking them to achieve something that is very difficult for them. And at that point, neither of you will be happy.
Good luck in your horse search.
They say money doesn't buy happiness -- well happiness doesn't buy horses!