SRB I have there Camidox CPro but don't think they do it any more but still available on flea bay it does warm the image a tad. I think some of the others 10 stoppers are very good value too and although have some cast it very easy to deal with. As for grads I do have Lee Grads but have found I use them less and less nowadays Of course it does also depend on the dynamic range of your camera but tbh It's very easy to blend two images in PS than faffing about with a grad and missing a shot because I've been pouncing around. Then if you have something like a tree or light house in the frame then you still have to faff in post anyhow.
If you have fleeting light or your chasing the light, faffing with grads can mean missing the shot, I have numerous times now I'd rather have the shot than miss it.
It is horses for courses, good to have grads if you have them, all a part of the armory to get the job done but it's not imperative to have them and if your on a budget....