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As for the Barlow, 2x is the recommended magnification, is that correct? Is it worth investing in a more powerful one?
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To give you an idea, on my 8" SCT at f/10, my Neximage 5 sensor, which is close to a 7mm eyepiece in terms of FL, is equivalent to 290x mag with a ~12' FOV. If I use my FR and take it down to f/6.3, it goes down to 183x with a 19' FOV. On my f/5 SW120 frac, it gives 86x with 40' FOV.
So the Barlow is not really required, but you can work out the higher mags and FOV quite easily from the above guidelines.