I have a little cash saved up and Im planning on spending it on some photography accessories. I'm thinking about some filters, such as infrared, ND and polarizing. From what I have read Im probably going to go with a hoya R72 for the infrared but I have no idea what to get for the others. I understand the ND filters come in different opacities, If I were to get two that I could stack what would be a good combination? What should I look for in a polarizer? Im also thinking of getting a fast prime probably around the standard 50mm. Im not looking for anything fancy, I don't want to spend more then $600 CND for everything. Im still learning so these are all just for general use. Any suggestions or info on what filters or lenses I should consider will be very appreciated. Also feel free suggest anything else you think I could benefit from in my price range. Right now all I have for equipment is my: Canon 300D, the kit 18-55mm lens, Canon EF 55-200MM lens, UV filters a remote shutter release and a low end tripod.