If you can afford the X or Z lines, good for you.
I would otherwise go with P series that are quite handy for small format DSLRs and for few ultrawide situations encounter, either cropping or pp clone stamp of periphery always has made my day trouble free. Avoid A line at all costs.
If you work on high volume and large number of images, then you probably make big bucks to afford more expensive lines. No mater what, Cokin is the answer to your question IMO.
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S a s s a n .
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"My home is where I walk across the street with my head erect.”
Heinz Alfred Kissinger
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