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I still think that an apochromatic barlow is the way to go. That way you only buy once and its good for ever. As for 2" v 1.25" I find I only barlow my 1.25" lenses, maybe becausse I only have an Orion Shorty Plus so its a bit hard to use on 2" lenses but my 2" lenses are for scanning large chunks of the universe not zooming in on the finer details.
If you are going to get a 2" then I would say get an apochromatic one from the start.
Cheers
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