Air pet all the way, expect to pay 1500p for a 63 pet low end. The 62 nuke is common (500p or less), AE rods and Burnoutblaze are a few kp a peice. Spells cost a ton, you best bet is to get a 63 pet, and the 62 nuke for grouping. I can tell you all the summon spells are useless except searfire, and even that is messed up I hear. The 64 pet heal, 63 pet (Air or Fire) and 62 nuke will have you feeling okay in groups provided you have damage mod (3+).
now reading over it, besides ancients and relics, the only spells worth the effort to find are Shock of Sun, a 63 pet, 64 pet heal and Storm of Steel. I have used Til's Intervening Enchantment, never have seen or heard of it work. Disposement sucks with the level 44 req for destory, easier to just normal nuke it otherwise. Monster summoning is not in SoD, The 64 pet aggro spell maybe ok, but I can rarely think of when I want my pet to tank (when not drunk). Flamecall is cool for faction groups, earthsplit and that are really common (not more than 300p each) . The caster buff is meh if you run around with buffs at all, but would be nice for when you got nothing, tbh I am way too lazy to self buff myself, I make it a point to avoid aggro.
That should be a rundown on spells, the AA's are equally disappointing. Pretty much chance to crit, and host of elements are useful.