ND grad kit is essential for landscapes. Then get a 10 stop ND to achieve milky water effect. Haida 10 stop filters are cheap and works great, no need to spend big money for those branded ones.
I stopped using my ND grad kit, found it took too long and was quicker to bracket and merge in post, also meant i wasn't stuck with a stright edge grad. Infact in Lightroom these days I don't even need to bracket and merge, I can normally get a 2 stop grad from the 1 raw file. These days the only two filters I carry are a Circular Polariser and a 9 stop ND, the effects of a 9 stop you can't replicate in Post and the polariser also adds a 1-1.5 stops when used if I need to slow waterfalls a bit. If you do want a kit the Cokin Ptype wide angle holder works well, then look at either cokin grad kits, or Format HiTech grad kits, and get a mix of soft and hard edges. or look at the Kood P type kits from Premier-ink
I agree, I usually only take one: a CPL for the camera I'm using. 10 stop 77mm for 5D lenses and IR filter for x100 only goes outside with the tripod. Cokin P series is only good for crop sensor and not very wide angles, I think I've got a set somewhere, they are not expensive. I've also got a expensive, larger Cokin Z-pro grad kit, it is only just about enough for 17mm on full frame. Having said ND grads are essential, I've only taken each set out of the house once or twice. I've never been on a trip planning to do just landscape shooting. The added bulk from the square holder and large filters make the camera large and difficult to work unless it's on a tripod. sotu1, you seems to be starting a lot of equipment threads. For a hobby, do keep in mind the amount of gear you can comfortably carry. Not much buying anything unless you are sure you can get its money's worth, I've learnt this the expensive way.
Haha yeah, well I picked up my camera a few months back but really enjoying it. I'm not great, but enjoying it and love tinkering. I used to do a bit of painting but never really found a talent for it and would always get bored of whatever I was painting halfway through. Photography I'm finding is much faster for me to get into and out of. And it gets me out of the house a bit. Also a lot of the bits and pieces aren't too pricey. Odd filters here and there aren't going to break the bank at all. It's the lenses that I'm holding off in investing in. Although the next investment will likely be a flash or a budget telezoom. The 55-200 F4-5.6 VR looks cheap and cheerful for £100. Again, nothing crazy expensive but will allow me to capture candids from across the street with investing 2 grand.