I'd go big! A 20 man crusader squad, ten Initiates and ten Neophytes. Neophytes all have pistol/
ccw, one Initiate with power weapon, another with a Meltagun. Have another upgraded to Sword Brethren with a Power fist (with the Champion in the unit you don't have to worry about him getting taken out via challenges).
300 points, but with the champion/captain leading them will violate any unit it charges.