I feel like Beacon of Light could get some tweak or rework. Mainly because of the overhealing, but also because there is no real bonus to heal directly the beacon (1 holy power for healing with divine light.... mheu). I would gladly have beacon of light do less healing and have it trigger when you directly heal it. I would prefer if it instead put an absorbtion shield.
As for Guardian of ancient King. I like the way it give extra healing on single target, but the splash aoe heal is bad. As for the increased speed on cast. It should be reversed. At first you get max speed (when you need it) and then it lower with each cast(when the burst damage slowly lower).
Finaly, seal of insight. I almost never go swing in melee. Mostly because I miss half my hit.
Let me know what you think of those spell. How do you use them. Are you swaping the beacon every 30 seconde? Is it glyphed and macroed to you'r divine light? Are all of those spell to your like and is there other spell you dislike?