You might get away with the cokin holder, but think you might be limited to using 1 filter at a time. Otherwise you may get vignetting in the corners on wide settings.
Do you have any friends etc near by who can let you try the cokin P system out to see if you have any issues with it?
Hitech filters are better than the cokin ones as theres less of a colour cast if you use 2 or more filters together.
http://cgi.ebay.co.uk/72mm-Adapter-R...item3cb71116bc
http://teamworkphoto.com/shop/index....ducts_id=10288
http://teamworkphoto.com/shop/index....ducts_id=10355
If you do get vignetting then the 100mm system would be better as there wont be any vignetting at the wider angles. However that will cost more money









