I think that a polarizer and UV filter is a good start.I have those made by Tiffen.Very happy.As far as IR I really don't have a use for.Yet. Prefer to use a lens for any close ups though, not filters. Not sure how decent they are. Not much help here, but let's hope this thread gets response. I'm always interested in this too.

"The happiness of a man in this life does not consist in the absence but in the mastery of his passions."