Mage Leveling Advice?

I'm leveling this Mage at the moment. I have been leveling as Arcane lately and I've dabbled in Frost back pre 70.

What is the best tree for leveling 70+?
What is a good example spec?
What type of glyphs should I look for?

I'd really like to try out being a Fire Mage if it is at all viable. Or Frost if that's viable too, but I'd prefer Fire. I just want a change of scenery for a few levels unless Arcane is significantly better

Feel free to offer advice on tweaking my Arcane spec/glyphs too, I probably didn't do it properly.

Thank you!
Shameless self bump?
I started this character a week before cata came out and have been frost the entire way, ice barrier was really useful when I had low HP and it absorbed a decent amount, but at 44k HP it absorbs pretty much the same amount as it did around 79, so after today I was going to try out fire and give it a shot. Frost is really fun, you should give it a shot last night I was ice lancing things for 11k easily.
Anybody have any experience with leveling as Fire? I've heard Fire is really fun. I'm just getting tired of using 3 buttons all the time.

Any other experience with Frost leveling?