hi marty,
im not too familiar with the IDAS filters I've got an astronomik ccd cls - but I've heard the IDAS are good too.
From looking at the graphs the P2 looks like its got a bit extra wavelength in the red. the material on the website seems to suggest that the extra bandwidth causes a bit of a red cast (when using a modified dslr).
http://starizona.com/acb/IDAS-Light-...P2806C737.aspx
perhaps a D1 will be a better option for you, while your camera isn't modified you wouldn't notice a difference with the P2 if you did modify it may cause a red cast.
Cheers