Alite, I read your skill tree over and I want to add some of my 2 cents into mana recharge, meditatio and my favorite skill, magnificat
One thing I want to make very clear is that magnificat is a very important skill if you want to be a somewhat of a support priest when necessary. When I priest, other than " buff please" or the desperate yell of "HEAL!!!!!", I hear "mag please." or "Mag me fker!" and etc. SP recovery is quite important while supporting, and its a must have for a support priest. Now to mana recharge.
Assuming your most spammed skill will be heal, with max mana recharge, your sp spent will be 32sp per heal rather than 40sp per heal. Blessing with max mana recharge will be around 47sp per cast rather than 60sp, and agi up will be 36sp per cast rather than 45 per cast. All together you save 30sp. Is 30sp really worth that 5 skill point? While other condition would probably apply, you probably wouldnt even have noticed that sp going missing if you have magnificat on.
Meditatio? no question about it that this skill is god send. I would max it no matter what. It would help compromise some int that is needed for increase in heal. Now, the % increase in sp is different. Depending on your max sp, the % increase in the sp may not be significant. My advice is to have a number of heal that you want, and try to match that up with your int, base level and meditatio. You may able to save some skill points to put it into magnificat(excellent support skill) or even gloria (may be avaliable upon request ._.) I saw the lack of gloria in your skill tree and well, I thought it helps for a battle priest.
My ultimate advice, would be getting magnificat over mana recharge. My high priest equips eggyra over verit or sohee because I get maxium sp recovery from eggyra, meditatio and magnificat (I dunno why the hell you want more SP as a FS high priest, I have 2.5k already /swt). People might tell me that eggyra sucks, but I love it because no matter how much heal spam I do, my sp bar never goes down. It stays full whether its bio lab, woe, pvp, whereever. But sometimes in bio lab, where I sometimes need to spam heal like crazy and my magnificat runs out, my sp is pretty much gone to at least 1/2 bar. Magnificat is important! Even at level 1 it will still provide the same recovery rate unlike mana recharge where you probably need max level to see the full benefit of it. But if you can work something out between the level of meditatio, mana recharge and magnificat, do that!
It would help to see your stat build next time also.