Awww.....T's so cute in that pic.
My recommendations are:
Stay away from Friesians. They're carriage horses and look fantastic while driving but their gait at trot and canter just sucks for jousting. Very bouncy at a trot and "rolly" at a canter. Exactly what you -don't- want for jousting and riding in harness. You'd probably look marvelous while riding and jousting but you'd score fuck all and may cause a safety problem 'cause your lance might go all over the place. Their brains can "fall out" occasionally and without warning. They get real stupid at the most unexpected and nonsensical things.
Friesian x Cob, however, is a completely different kettle of fish. They look marvelous, have glass smooth gaits (at least the 2 I've ridden) and are much more sane than the pure friesian. Question is, can you find one in this country? You might look for a Gypsy Cob x Friesian, sometimes calle a "Gypsian".
Stay away from "gaited" horses. They take a special hand and leg to ride effectively even when unarmed, and they have a tendency to avoid cantering. Some fine control goes away when your armed, so finding all the "gears" on a gaited horse is really tough, and bringing them up into a canter through their other gaits is tricky. More than you really want to mess with when you're jousting. So many other horses, usually cheaper, will do a better and easier job of it. Fact is, you need the canter and gallop when you joust. A super-fast "tolt" or "racking trot" or "pace" just won't cut it. In fact those specialty gaits -get in the way- when you're jousting and just detract from the matter at hand.
Sorry to burst your bubble with the Friesian, but if you go out an ride one, I think you'll agree with me. With any horse prospect, ride it a few times before purchase to know what you're getting into. Some horses you think aren't prospects turn out to be so, others you think are perfect loose their minds when you least expect it. The more you pay for a horse, the more you should carefully consider the purchase, unless of course, you're made of money.
Bonne Chance!