I can learn apportation, but am still looking for a book with good spells ...
After 10 levels of spellcasting, you take what you can get, then use amnesia scrolls if you find something better, specifically...
a book of air
This has swiftness and repel missiles, so unless you're wearing heavy armour, aptitudes be damned. With 10 spellcasting and decent int those spells should be under 20% fail, and a bit of charms skill will take that down another notch. On another character, Flight would also be useful, but you get that as a Gargoyle for some reason.
looking for low level earth or conjuration spells
This would be a good plan if you were with Sif and thus could expect to eventually get the spells you want.
... recently found the book of ice, and i'm thinking about learning "Ensorcelled Hibernation", so I can level Ice enough to get "Bolt of Ice" and level conjurations
So you already dumped 10 -1apt levels into spellcasting without using them, and now you're planning on dumping another 10 levels into ice and conj each before you can use them? That sounds a lot more dangerous than--
But, as I just spent most of my Lair XP getting level 10 in shields, I don't want to fall behind and get bashed by a pack of death yaks ... :/
You'll have swiftness. Death yaks do not have ranged attacks. You can run away.
Edit: Oh right, and don't forget that useful time-saving apportation. Assign it to a macro so you can easily clear rooms of items without stepping in. (I use - or +, since those cycle items in targeting.)