filter and conkin holder - maybe

i have a digital rebel
i need to get a filter set
i will be using a 17-40 F4L that has a 77MM filter size
i also have a EF50 1.8 with a 52MM filter size
i also have a rebel kit lens 58MM filter
i understand the conkin P holder will allow me to use filters for the biggest size lens (77) on all three
true?

i need at least a polorizer and grad ND
i am considering a color enhancer for fall colors but am not sure if there is an advantage over post processing adjustments

other filter suggestions appreciated

my primary application is mountain and lake landscapes

...

I think that Cokin P system is the way to go. You can use same filter on all you lenses. I doubt that color enhancers or even polarizers are very useful with digital, but postprocessing cannot replace graduated filters. I also plan to use diffusers and fog filters.

2 days ago I ordered P holder, adapter rings, graduated G2 and fog 2 filters from www.2filters.com I supposed to receive it today

Check out this http://www.geocities.c​om/cokinfiltersystem/i​ndex.htm
you can find a lot of useful info concerning Conkin filters

response re filters

thanks
let me know how it goes after you recieve and test the holder
i can not reproduce the effect of a polorizer in post process
the sky seems to have so much more dimension with the filter
perhaps there is a plug in or process i do not know about
...j