I have decided I NEED CP filters, and worked out it would cost the same to deck out 4 different thread sizes with 4 different Hoya CP (the cheaper ones) filters as it would to get the Cokin system. The advantage of the cokin system obviously being I can now add more filters to my collection quite cheaply. So my question is, are the Cokin filters good? Or am I better off spending more $$ on better quality Hoya filters?