B&W CP, or Cokin?

Ok, right now I have a Canon CP, 77mm. Any opinions on selling it for a B&W that has the front threading, or should I just go with a cokin P series.

I use a 24-105L and a 35L. With the Cokin I could use one filter for both lenses. I use a slim filter holder though becaues of vignetting on a 5D. So I figured maybe with the B&W i could just thread the Cokin g.ND infront if I ever need both together. Then I would need a CP for each lens. (35L is 72mm)

I don't often use a CP. So maybe could I get away with just the cokin on both.

B+W for polarizers. What filter(s) would you be using with the Cokin holder? But bear in mind that the reason you need the wide adapter is to prevent vignetting, and to do that that you sacrifice filter slots, so mightn't be able to use a polarizer with another filter even with 2 Cokin filters.

I only use one filter with the Cokin. A Grad. Neutral density. Thats what I have now. I was thinking of getting the CP that cokin makes that fits my existing holder.

I'd get the 77 mm B+W and a step-up adapter to get you from the 35, or the macro, to the filter. Cokin's filters aren't the greatest although their holders are pretty nice.