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You will be limited in how much magnification you can use by turbulence in the atmosphere. You will rarely be able to use more than about 250X which would be about a 5mm ep if your scope is f6. A 2x barlow is a very useful tool and I would suggest not thinking about any further eyepiece investment than that until you're quite familiar with your scope and know what focal lengths you'd like and what to look for in an eyepiece. You may well find that often your best views of planets are not at high power, as poor seeing blurs detail. I often find Jupiter best at 135-175x in my scope - smaller, but with crystal clear details that are lost at 250X. So don't get too keen on seeing them big, go for clear is my suggestion. And they are never going to fill the eyepiece.
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