Selecting a telescope

I am looking to buy a telescope but never having had one before, I am
uncertain what size (aperture) telescope to get. After some investigation I
now am thinking of something like a 6" or 8" reflector. I would like the
opportunity of looking through some telescopes to see what can actually be
seen. Does anyone have any suggestions. I live in Ross on Wye,
Herefordshire.
Also, how worthwhile (for a beginner) are the computerised GoTo systems.
They sound like a great idea, but they add a lot to the cost, and are they
accurate and reliable?
One more question while the going's good. Both Meade and Celestron appear to
have good ranges of telescopes. Does anyone have any comments about these
makes, good or bad.
Thanks


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