Ive always had a bit of a soft spot for the 25 pdr, coming in at 40/50/60pts for inexperienced/regular/veteran respectively with the option for a 10pt spotter [always handy!]. The fact that it can be used as a light AT gun as well as a light howitzer gives the weapon platform a flexibility in how it supports your men.
The Crusader AA was just one of those purchases i made because I liked the look of the vehicle, then again ive always been a fan of automatic cannons even if they don't seem to do too much in the game of Bolt Action. Plus its always fun to shoot down your opponents air support!