Re: Broadhead suggestions for new crossbow.
If your arrows have aluminum inserts up front, I would stick with 125 grain heads and up. Brass inserts, 100 grains work well.
As far as broadheads. Your Excalibur should love Grim Reapers, Spitfires, Swhackers, Wasp Jakhammers, Ulmer Edges. I have shot them all out of my Excalibur.
I have gotten great flight from G5 Strikers, Slick Tricks, Razor Tricks, and Ramcats for fixed heads.
I support all hunters, regardless of weapon or technique!