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The 20 and 10mm eyepieces that come with the 'scope (odd since it is normally 25mm and 10 or 9mm) will give you 1200/20=60x magnification and 120x magnification. A 2x Barlow will make your 20 a 10 and your 10 a 5 (Doubling up a bit but the 5 would give you 240x mag which is a bit high for planets on most nights but possible when the air is very steady, ie. good seeing.
I would recommend a 32mm Tele Vue Plossl that will give you 37.5x and a true filed of view of 1.3 degrees. A very nice low power eyepiece that can be used on any telescope. You can add a Barlow to the 32mm but the eye relief will be too big. You could buy the 15mm Plossl and later the 2x Barlow to give you 7.5mm to give 80x & 160x respectively and that is about all you will need. Tele Vue is a very nice brand and reasonably priced with the Plossl range. The wider field Tele Vue eyepieces do start getting expensive but you are paying for sharp stars to the edge of the field.
Bintel are the Tele Vue agents and they also carry the Meade 4000 series Plossls which are very well priced and quite good eyepieces too.
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