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I'l suggest a fast 100mm refractor, around f/7 on a simple but rock-solid altaz mount. These are great for a casual look at things from the city and will keep you happy for a long time, without being to cumbersome to assemble or store.
The point of these refractors is that they are the equal of the SCT/Maksutovs or Cat Newts up to about 130mm aperture, as these have higher internal light losses and a central obstruction. Also the refractors are dead-easy to use, and at f/7 the field of view is wide enough to give good views of interesting starfield and the moon, without being a pair in the rear to aim.
For a good look at the planets though - even Jupiter, Saturn or Mars, you will need a longer focal length and at a later time you could upgrade to say a 150 - 180mm Maksutov if you are really prepared to get into it a bit more.
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