As Mark W says, as much of everything as you can afford.

I use a T2500 core duo with 2gb ram,256 Vram and sata HDD, and this has no problem with DV editing but really starts to struggle with HDV, I mean it does it and the final output is top quality, it is just a bit sluggish during editing if I start using effects.

Mike.

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Edius Pro, ADVC300