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Also, for the 127mm achromat, add an Minus Violet Filter, like the Baader Semi Apo or Fringe Killer. Other brands have similar MV filters as well. When fitted to the eyepiece or Diagonal they help to reduce the colour fringing.
I have an home assembled Surplus Shed 127mm Achro among my collection of scopes and I find it performs 80 / 90 % as well as my 127mm triplet, for 1/4 the price. The 127 will also be ahead in resolution and on nights of good seeing, have pushed it to 250 / 300X mag before it gets too soft an image.
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