Stacking Spellpower as a Paladin is actually a very poor choice of Itemization because it often ends up as overhealing. Of course you want to push up to past 2k healing, but gemming, trinketing, libram for it etc is a really poor plan.
That being said -113 mana to HL, with Glyph of Seal of Wisdom (-5% cost to all spell casts) with a 4 piece T7 all make HL more affordable, better yet when you crit with HL it gives back 60% mana of the base cost. So you can get your HL down almost 1k mana to cast, but when you crit you get 60% of 1273 mana back. Despite warnings about stacking SP, I would still like to have the FoL one in my inventory just for specific fights.
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Bode - 100 Holy Paladin - Lightbringer