Howdy Phil, let me be the first to welcome you and try to convert you to the wonderful world of meade tracking and goto. If you've already got a Canon EOS 20D then you are going to *hafto* get into digital imagery. Here let me help you get a second and third mortgage on your house
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Seriously though don't listen to Tony, you'll know him when you meet him...Hi Tony
...but seriously, if you're just starting and you want to get your socks blown off then appeture rules. I don't own one but sometimes I would like to, especially when the clouds only break for 30 minutes or so, think about (I don't believe I'm saying this
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DOB . If you want to get into some imagery and you've already got a great start, think about tracking (goto not essential). I'm sure others here will happily give their two dobs worth. Usually the 8" or 10" but sometimes its the 10" or 12"
Ask yourself, "what do I want to look at/do?"