Nice, little twit on their darker brothers, the Black Templars. If your going the knightly rought, definately invest in some Chaos Warriors (chaos markings and horns clipped/filed off of course

) and Brettonians. Their medieval styled bits and relics would greatly bring in the whole crusaders feel, plus giving hint to their source of inspiration. Some ideas I thought of for my own BT's could go with yours as well... if you wanted to hear them anyway.
-Halo 3 styled brute chopper bikes with relics and "coat of arms" shield as a protective front visor
-Landraider Crusader Chapel/Cathedral
-Ornate GS modeled Honour Guard with Bretonnian/Hornless Chaos Warrior Helmets
-Neophytes (same as scouts... use as per your army) with empire armored helms and CCW's
-Mini Cathedral or Clockwork style Dreadnought (protecting a relic/holy grail?)
-Accompanied Kill Team of Brettonian styled specialists (picture below)

I appologise, as I do not know the owner of these beautiful mini's. If he or she is on the forums and stumbles upon this, please speak up so we can know who did these. Fabulous work and inspiration!
Just my two cents. Awesome Job so far, keep up the great work! I will definately be following this.