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ED scopes will give great results, these are usually a 'doublet', and will give great widefiled results.
A triplet is a bit of a step up if you can get one at a good price, you will generally get less chromatic abberation with a triplet, with a doublet you may get a little blue bloat around some stars etc. but at smaller apertures, this is readily handled.
The ED80 is a popular choice, and available 2nd hand for under $400, I personally love 4" scopes, they are a lovely balance between portability and handling, but with a bit more resolution than an 80mm, I'm very happy with my 105mm scope.
Take a look at some photo galleries and you will see some great results with 80mm, 90mm and 100mm scopes. I'd make a decision as to the model, then ask people what they think of that particular one before pulling the trigger.
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