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Hi Deeneil,
Welcome to Ice in Space! My feedback is that if you are fairly new to your telescope, it might be best to wait before investing in new eyepieces etc. Forgive me if I've got this wrong, but you sound like you are still finding your way around and often you will discover more observing power as you get more experienced. Going to some star nights is of great benefit. You can learn a lot about the sky and which equipment might be useful. I could highly recommend the Snake Valley camp in October as a great place to get help with gear and observing - alas I won't be able to make it this time.
Having said that, your highest mag eyepiece will give you about 160x which is good for planetary viewing. Usually the maximum that you can use is about 300x due to atmospheric disturbance and I find it quite uncommon to be able to use this much magnification. About 160x is often the upper limit of magnification for my observing due to the limitations of "seeing". If you want to get to 300x you would probably find a barlow useful as plossl eyepieces of short enough focal length to achieve this in your scope (ie 2-3mm) have very little eye relief. Barlows can actually improve the optical performance of eyepieces in some settings, so they are not a second best option by any means.
Hope this helps.
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