If you're mostly soloing or boxing, I'd get to a high level (as high as 95), and then pay 1 month's sub and get all AAs auto-granted.
If you're already subbing, just turn on auto-grant and don't worry about it.
If you don't like either of those approaches, then I can only mention Spell Casting Mastery and Mental Clarity as some of the best choices, at least the first two levels of each. Also Innate run speed, if you don' have a way to keep SoW up all of the time. Other than that, I don't know enough about the cleric class to have more specific recommendations.
Tat
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Tatanka Wolfdancer, 115 Wood Elf Druid, 9 x 300+ Master Artisan, 7 maxed trophies (dang research! :)
Michone, 115 Troll Shadowknight
Anaceup Mysleeves, 115 Erudite Mage, 2 x 300 Master Artisan
Snookims Whinslow, 112 Erudite Enchanter, 2 x 300 Master Artisan
<Inisfree>, Tunare (Seventh Hammer!)