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The Long Perng 6mm and 9mm work well in my f5 dob. Should be OK for f4.7, and will give you around 200x and 130x respectively, which are good magnifications for planetary observing. Also you can get both from Andrews and still be well under budget...
Light pollution is not really an issue for the major planets as they are bright and easily visible even from a city. A bigger problem is turbulent air rising from city buildings, pavements etc., so you will find there are times when 200x is too high, and you will be better off with the 130x.
You will also need to give your mirror time to cool down: don't expect to get good high power views when you first take it outside!
All the best, and good luck.
Dean
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