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I have a similar achro to Rick and Barry, a Sky Watcher 120mm F5. You can kind of get away with it better on some objects than others. A nebula filter will reduce a lot of CA, as with the eta pic here. But M42 (no filter) is horrible.
Does it have to be a refractor? Small reflectors are very cheap even brand new these days. They offer a big bang for your buck. On the down side they need collimation and a coma corrector for photography. But they've won me over. APO refractors are too expensive for me. I have an ED100 (which is great) but a bit slow compared to the Newtonians.
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