i recommend small paddle DMTs, the same ones you'ld edge skis with, for nick removal. 'rounding' out the nick and then moving to a diamond (or other) bench stone is a little faster and less annoying as the knife won't drag and 'catch' on your stones.
That's bad enough if you're using DMT stones but REALLY annoying on fancy waterstones..
http://www.craftsmanstudio.com/html_p/TD2K.htm FOR EXAMPLE ONLY.. price may not be lowest, don't know the vendor, YMMV.
if you ever want top grade waterstones that compete with DMT I recommend Shapton (for large bench stones, synthetic & not cheap).. or Belgian Coticules (garnet abrasive, very fast, top shelf by anyones standard, and VERY not cheap... but worth owning anyway)
and the finest grade DMT ( EX-EX-Fine) is an 8000 grit (3 micron) single sided plate that is one fancy tool, about 70-80$ for the 8x3 , and too specialized for most folks needs.. but it'll do fine touchups on very hard steel and make it look easy. HIGHLY recommended to put a scary sharp finish edge on hard steel without spending weeks at it..
and they have a 4" version for 22$.. catalog # DMA4EE.
FWIW i remove knicks with a 1.25" x 6" belgian garnet stone. it's faster than silicon carbide but slower than diamond, and polishes as it goes..
diamond scratches aren't easily polished out and cleaning up the edge & flats on the blade might take more time than the sharpening. Belgians have an extremely wide spectrum of utility, and sharpen faster than most alternatives.. while still allowing a mirror polish if you prefer that. I have several fancy japanese waterstones that polish as well.. but they're much slower to actually grind metal.. and vice versa, the ones that cut faster don't polish so well.
There may well be sufficient utility in synthetic stones now to make natural ones redundant.. but I don't know of anything else with the RANGE of belgian coticules, nor anything more pleasant to work with. If you get a chance to use one, try it out. Hard to put down..