If you don't mind waiting, I'd say wait for LGA2011, or even 1155. Both will have some great new chips, although expensive.
If you can't wait, then try this:
i7 920 ~$200
6GB DDR3 1600MHz (Corsair, G.SKILL, etc) (http://www.newegg.ca/Product/Product...82E16820231335
Any decent X58 mobo (ASUS, Gigabyte) (http://www.newegg.ca/Product/Product...82E16813128423
A GTX 470, maybe 480 (or maybe 580????) $500 - $600
About a terabyte of HDD ~$60
A BluRay burner maybe? ~$A lot
As for a case, that's up to you to decide. Lian Li makes great aluminum cases, Antec has good gaming cases, Cooler Master, etc. There's a lot to choose from.
Although this may be overkill for gaming, HD video editing can benefit from the high processing power of the i7.
I'll get you some specific suggestions soon.Edited by AutoItKing - 11/21/10 at 3:43pm