Never really played much of the Fire sorc, I'm just wondering if it's a good mfing and player 7 killer with just a -72 fire sunder since I dont have infinity or if I should just stick to Blizz right now until i can afford an infinity.
If anyone can help with the best fireball/meteor build as well that would be appreciated

Imho Infinity is almost must have to put this build somewhere around s-tier. Otherwise it's just very nice but not that good as lite sorc. Of course if we are talking about player8 efficiency. Also you need a lot of fire pierce from items like Flickering Flame and Phoenix. 6x Facets sword can be a great option instead of Phoenix or even with Phoenix.

Wait until you can get infinity and phoenix