Good quality astronomical telescopes are very expensive, The telescope mount will cost a similar price to the actual telescope. I would recommend a 6 inch (15cm) reflecting telescope which uses a 6inch diameter mirror rather than a 6inch diameter lens. A 4 inch refracting telescope which uses a 4inch lens, would be also be a good first telescope. Under high magnification you would get a good view of the planets and be able to see the cloud belts of Jupiter and the rings of Saturn. At these magnifications a driven mount is very useful as it counters the rotation of the Earth. Under low magnification you would get excellent views of nebulae, star clusters and galaxies.
E-bay is a good place to look.