I invested in Lee filters.
I bought the following:
- Lee Foundation Kit (ie, the holder);
- 82mm wide-angle adapter (to mount the holder to the lens);
- 0.6 (two-stop) 6 x 4" soft GND filter; and
- 0.9 (three-stop) 6 x 4" soft GND filter.
I bought all of the above from
www.studiokitdirect.co.uk.
At the time (April, 2009), the UK price came to £181.25, and the amount debited by Studio Kit Direct totalled $378.67.
Locally, Vanbar wanted $577.50 for the same gear!
I steered clear of the Cokin filters, as they are known to introduce a magenta/purple colour cast. See the following image and discussion for details:
http://www.flickr.com/photos/brentbat/2372603825/