To add/reword what Jamzimm said... approved stallions stud fees really are NOT thousands of dollar. There are many great approved stallions available for $1500 (to me, that's nothing for quality...)
I don't really like to get caught up in the chatter that is so prevalent on the internet but let me try and correct some other information that has been posted on this thread. I hate reading misinformation. This information has also been printed in Phryso.
I don't know why people think you can get punished for cross breeding or breeding to a non-approved stallion. That is not the case, however, if you want to perform and keep a reputation you need to make a decision on where you stand and where you go. So no, a ster mare won't lose her title but why would you breed a ster mare to anything other than an approved stallion, unless it's an experiment or accident. Think about the future. If it is for cross breeding or something specific otherwise or a mare that doesn't have a predicate, then do what you will.
A stallion won't lose his license either but it won't be looked favorably upon if he breeds everything that moves so it's just not worth it to get run-of-the-mill offspring.
A stallion in the US is either fully approved or not approved or D book approved (by FPZV) so you either get a fully registered offspring, a BBII offspring or a D book. The latter two take breeding back to an aproved stallion to get back in the main book so why even bother unless it's a cheap breeding option with a quick way to sell a black Friesian, because regular stallions don't cost much less to breed to all the way around. This can also be found in Phryso, Phryso Intl., and int the studbook brochures, newsletters, and more.
And of course no matter what you do there will be some group of people that will print you a piece of toilet paper registration, that's not the issue, but is it what you want and want to invest 1 to 2 years in?
I hope this helps a little. I don't beat around the bush.
As for my favorite approved stallion right now, I adore adore adore Sape 381. I love his lines as I had mentioned before, there are only Fabe and Melle approved right now with Age lines. And now that Sape is in America, he is my go-to guy! He also happens to be sired by Teake's sire so I'm a bit biased. I LOVE their type. I'm not fond of the sporty ones...