Archetypes

[ZeronosVega]

I'm only planning on 1 archetype/class at the moment, so even though all three of your ideas aren't bad I'll probably end up with only 1.

I see. Well, I'll be sure to create a nice back catalog of ideas if you or anyone else decides to make more.

Holy Dragoon: What would you give up from the dragoon for spells? If it's based on the Holy Knight, you can trade Holy Strike and one of the other level 2 abilities for Jump and Deadly Lancer. Anyway, I think someone else was working on this.
Dragon Knight: Seems like the tail sweep ability could be given up for a breath weapon.
Mounted Dragoon: Getting a medium sized dragon instead of Jump and/or Deadly Lancer might work. It would improve at levels 7 and 15. How much is the dragon companion worth? (keeping in mind that it'll be relatively the same power as animal companions/mounts)? This one seems like the best bet, to me.

What to give up for the spells has been something that has troubled me for some time, now. If you recall, I had tried to create an alternate class feature for Dragoons, but could never think of what to get rid of. My original idea was something along the lines of Deadly Lancer and maybe something else, such as Flexible Flanker. Basically, removing the less 'honorable' abilities in favor of something more knightly.

For Dragon Knight, it seems reasonable enough.

For the Mounted Dragoon, I see the mount/companion as being much like a Paladin special mount from Pathfinder/D&D. Though, summoning the companion might be a bit much, but I don't know if an ever-present one would be unbalanced.

Current ideas
Crossbow Specialist? (Archer, uses crossbow instead of bow, single shot specialty instead of volley type?)
Death Knight (Dark Knight, necromancy things)
Juggler (Chemist, juggles things, not sure what to do here since it's already based on throwing)
Spellthief (Thief, can steal spells, has to steal in order to cast. Gives up Sneak Attack?)
Soldier (Gunner, single rifle instead of dual pistols)
Tamer (Beastmaster, summon critters)

I'm liking what I'm seeing, though I can see where the Juggler could be difficult to come up with abilities. This is one instance where I feel an archetype wouldn't be able to offer enough of a change. Instead, the Juggler feels like an evolution of the Chemist, which a prestige class should be.