And your Atoma is MUCH more adept at grinding knives than flattening stones. IMO, spending $125 solely to flatten a stone is money poorly spent. IF you have such dramatic chipping and such limited time to repair it, use the Atoma. A 320 does the same that a 140 does, it just takes incrementally longer to do it.
E.g., Atoma 140 chip removal: http://www.chefknivestogoforum.com/kanji-id-t1281.html