I got myself the following along with the Lee holder and WA adaptor ring.
Hitech 100 ND Grad Filter - ND 0.6 (SOFT Edge)
Hitech 100 ND Grad Filter - ND 0.9 (HARD Edge)
Hitech 100 Neutral Density Filter - ND1.2
Unfortunatly, they have a serious magenta color cast. I'm willing to accept a small amount, but my photos show worse casts than I have been able to find on the net.
Which other brand should I go for? I'm looking at Lee filters as they are not too much more cost wise.