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Here is another opinion for you to consider...
with a 10" SCT you have a pretty narrow field of view, so considering your current ep/barlow I would be looking for less magnification myself. Putting a 40mm ep in that scope will allow better views of larger things like omega centauri. Asterisms like the jewel box will be sharper and more colourful also. You will find that on nights when the "seeing" is average or poor (in other words a lot of the time) a lower magnification will show objects with much more clarity than with your higher magnifications. It's a matter of choice really, a trade off between clarity and a little more detail. Personally I prefer a clear sharp view over a larger not so sharp view anynight. As an example I regularly view the little eta carina homunculus nebula with a 40mm in my 11" and prefer the crisp clear view this gives me to one which is larger but less distinct.
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