Looks like you have the shoulders and gloves at this time. You have the 2-pc bonus now, which is great; the 4-pc bonus may not be worth pursuing if you are working towards moving up to T10.
Normally, head, chest and legs offer the more substantial upgrades. The T9 legs have haste, so if you are interested in boosting crit and SP, I would aim toward the helm first. The helms that drop from Ony are something to consider going after. They offer you a good alternative if you can manage to get the drop.
With the chest, you may want to consider the crafted 245's, the
Royal Moonshroud Robe is a great upgrade if you can manage the mats for it. (I use the Merlin's Robe, myself, but I normally am Disc and have less need for regen in general and Spirit in particular.)
I, personally would trade one of your trinkets for
the Talisman of Resurgence. Int has a better return for your regen than Spirit, and you can macro the on-use portion of it to a spell that you use during "oh-crap!" moments like Guardian Spirit, Divine Hymn or PoH.
Although Holy does utilize Spirit for both regen and SP, I still subscribe to the theory of gemming Int for efficiency and SP for throughput. Of course there are exceptions when the bonus makes sense to gem a purple or green, but a pure spirit gem is a wasted opportunity to fine tune your gear as I see it.