Two questions, if you please.

Is it worth the mental tps to get 20 ranks in one of the elemental lores to be able to attune to it? I mean, if I started hunted up in Pinefar for a lotta trains, would it be worth it to attune to fire. I know I might have to sacrifice three or four elemental spell ranks, but would the benefit of always having fire 435s, stronger DC fire crits, being able to eblade to fire, etc be worth it. Opinions welcome.

Also...what spells can be <chant>ed and used with 712. I thought it was pretty much anything, but someone said area spells don't work. I sorted wanted to use 410. Any helpful hints?
Thanks, Janarth, getting back into the swing...