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Hi Stephen,
I'm not sure what the standard eps are that come with your scope. Magnification for viewing planets or anything through a ground based scope is limited to about 250-300x on most nights. If you've got an ep of about 10mm fl and a 2x barlow you will be at about 240x assuming the fl of the scope is 1200mm. So this would be about as good as you'd get except on nights of exceptional seeing. Even then on most nights i find planets are best viewed at about 180X as although the mag goes up the image quality goes down. Especially if you are viewing when the planet is low in the sky and you're looking through lots of unstable air. You won't get much joy out of Saturn till 3 am at present. You may see some faint bands, but mostly what will stand out are the rings. Mars you should be able to see good detail on a small disc with patient observing. It won't jump out at you, but you should still see ice cap and dark features.
Hopefully your scope is well collimated otherwise you won't see much. Stars should be points of light and not have little tails.
I wouldn't rush in to get new eyepieces. They can make a difference, but getting the right mag for the nights conditions, having a well collimated scope and learning to observe detail are the main things to sort out.
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