Traditionally they are good for landscape shots - which 17mm would be fine for IMO.
Unless you are going to buy a wide angle anyway - I wouldn't buy a wide angle just for the ND filter's sake.
Maybe check the sizes - you might be in luck and be able to use it on both (unlikly)
however my 10-20 and my 70-200 for example are both 77mm
so I can switch my uv, skylight, cpl and nd between them